September 2017 Update
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Ingy döt Net
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14570 changed files with 153136 additions and 63871 deletions
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/*REXX program classifies various positive integers for types of aliquot sequences. */
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parse arg low high L /*obtain optional arguments from the CL*/
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high=word(high low 10,1); low=word(low 1,1) /*obtain the LOW and HIGH (range). */
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if L='' then L=11 12 28 496 220 1184 12496 1264460 790 909 562 1064 1488 15355717786080
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big=2**47; NTlimit=16+1 /*limit for a non─terminating sequence.*/
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numeric digits max(9, 1+length(big)) /*be able to handle big numbers for // */
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#.=.; #.0=0; #.1=0 /*#. are the proper divisor sums. */
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say center('numbers from ' low " to " high, 79, "═")
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do n=low to high /*process (probably) some low numbers. */
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call classify n /*call a subroutine to classify number.*/
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if L='' then L=11 12 28 496 220 1184 12496 1264460 790 909 562 1064 1488 15355717786080
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numeric digits 20 /*be able to handle the number: BIG */
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big=2**47; NTlimit=16+1 /*limits for a non─terminating sequence*/
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numeric digits max(9, 1 + length(big) ) /*be able to handle big numbers for // */
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#.=.; #.0=0; #.1=0 /*#. are the proper divisor sums. */
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say center('numbers from ' low " to " high, 79, "═")
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do n=low to high; call classify n /*call a subroutine to classify number.*/
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end /*n*/ /* [↑] process a range of integers. */
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say
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say center('first numbers for each classification', 79, "═")
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class.=0 /* [↓] ensure one number of each class*/
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do q=1 until class.sociable\==0 /*the only one that has to be counted. */
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call classify -q /*the minus (-) sign indicates ¬ tell. */
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call classify -q /*minus (-) sign indicates don't tell. */
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_=what; upper _; class._=class._+1 /*bump counter for this class sequence.*/
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if class._==1 then call show_class q,$ /*only display the first occurrence. */
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end /*q*/ /* [↑] process until all classes found*/
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say
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if class._==1 then say right(q, digits()) 'is' center(what, 15) $
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end /*q*/ /* [↑] only display the 1st occurrence*/
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say /* [↑] process until all classes found*/
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say center('classifications for specific numbers', 79, "═")
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do i=1 for words(L) /*L: is a list of "special numbers".*/
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call classify word(L,i) /*call a subroutine to classify number.*/
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end /*i*/ /* [↑] process a list of integers. */
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exit /*stick a fork in it, we're all done. */
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/*──────────────────────────────────────────────────────────────────────────────────────*/
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classify: parse arg a 1 aa; a=abs(a) /*obtain number that's to be classified*/
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if #.a\==. then s=#.a /*Was this number been summed before?*/
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else s=sigma(a) /*No, then classify number the hard way*/
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classify: parse arg a 1 aa; a=abs(a) /*obtain number that's to be classified*/
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if #.a\==. then s=#.a /*Was this number been summed before?*/
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else s=sigma(a) /*No, then classify number the hard way*/
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#.a=s; $=s /*define sum of the proper divisors. */
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what='terminating' /*assume this kind of classification. */
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c.=0; c.s=1 /*clear all cyclic sequences; set 1st.*/
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if $==a then what='perfect' /*check for a "perfect" number. */
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else do t=1 while s\==0 /*loop until sum isn't 0 or > big.*/
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m=word($, words($)) /*obtain the last number in sequence. */
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m=s /*obtain the last number in sequence. */
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if #.m==. then s=sigma(m) /*Not defined? Then sum proper divisors*/
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else s=#.m /*use the previously found integer. */
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if m==s & m\==0 then do; what='aspiring' ; leave; end
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if word($,2)==a then do; what='amicable' ; leave; end
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$=$ s /*append a sum to the integer sequence.*/
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parse var $ . word2 . /* " " 2nd " " " */
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if word2==a then do; what='amicable' ; leave; end
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$=$ s /*append a sum to the integer sequence.*/
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if s==a & t>3 then do; what='sociable' ; leave; end
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if c.s & m\==0 then do; what='cyclic' ; leave; end
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c.s=1 /*assign another possible cyclic number*/
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@ -47,17 +46,14 @@ classify: parse arg a 1 aa; a=abs(a) /*obtain number that's to be cl
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if t>NTlimit then do; what='non-terminating'; leave; end
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if s>big then do; what='NON-TERMINATING'; leave; end
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end /*t*/ /* [↑] only permit within reason. */
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if aa>0 then call show_class a,$ /*only display if A is positive. */
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return
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if aa>0 then say right(a, digits() ) 'is' center(what, 15) $
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return /* [↑] only display if A is positive.*/
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/*──────────────────────────────────────────────────────────────────────────────────────*/
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show_class: say right(arg(1),digits()) 'is' center(what,15) arg(2); return
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/*──────────────────────────────────────────────────────────────────────────────────────*/
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sigma: procedure expose #.; parse arg x; if x<2 then return 0; odd=x//2
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sigma: procedure expose #.; parse arg x; if x<2 then return 0; odd=x//2
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s=1 /* [↓] use only EVEN | ODD ints. ___*/
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do j=2+odd by 1+odd while j*j<x /*divide by all the integers up to √ X */
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if x//j==0 then s=s + j + x%j /*add the two divisors to the sum. */
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end /*j*/ /* [↑] % is the REXX integer division*/
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/* [↓] adjust for square. ___*/
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if j*j==x then s=s+j /*Was X a square? If so, add √ X */
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#.x=s /*define divison sum for argument X.*/
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end /*j*/ /* [↓] adjust for square. ___*/
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if j*j==x then s=s + j /*Was X a square? If so, add √ X */
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#.x=s /*define division sum for argument X.*/
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return s /*return " " " " " */
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