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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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24
Task/Eban-numbers/J/eban-numbers-1.j Normal file
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Filter =: (#~`)(`:6)
itemAmend =: (29&< *. <&67)`(,: 10&|)}
iseban =: [: *./ 0 2 4 6 e.~ [: itemAmend [: |: (4#1000)&#:
(;~ #) iseban Filter >: i. 1000
┌──┬─────────────────────────────────────────────────────┐
│19│2 4 6 30 32 34 36 40 42 44 46 50 52 54 56 60 62 64 66│
└──┴─────────────────────────────────────────────────────┘
NB. INPUT are the correct integers, head and tail shown
({. , {:) INPUT =: 1000 + i. 3001
1000 4000
(;~ #) iseban Filter INPUT
┌──┬────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│21│2000 2002 2004 2006 2030 2032 2034 2036 2040 2042 2044 2046 2050 2052 2054 2056 2060 2062 2064 2066 4000│
└──┴────────────────────────────────────────────────────────────────────────────────────────────────────────┘
(, ([: +/ [: iseban [: >: i.))&> 10000 * 10 ^ i. +:2
10000 79
100000 399
1e6 399
1e7 1599

36
Task/Eban-numbers/J/eban-numbers-2.j Normal file
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ebanseq=: {{ (#~ y>:])}.,@([+/~1000*])^:(6<.<.1000^.y)~(,0 2 4 6+/~10*0 3 4 5 6) }}
(,:&":~ #) ebanseq 1000
19
2 4 6 30 32 34 36 40 42 44 46 50 52 54 56 60 62 64 66
(,:&":~ #) (#~ 1000<])ebanseq 4000
21
2000 2002 2004 2006 2030 2032 2034 2036 2040 2042 2044 2046 2050 2052 2054 2056 2060 2062 2064 2066 4000
# ebanseq 1e4
79
# ebanseq 1e5
399
# ebanseq 1e6
399
# ebanseq 1e7
1599
# ebanseq 1e8
7999
# ebanseq 1e9
7999
# ebanseq 1e10
31999
# ebanseq 1e11
159999
# ebanseq 1e12
159999
# ebanseq 1e13
639999
# ebanseq 1e14
3199999
# ebanseq 1e15
3199999
# ebanseq 1e16
12799999
# ebanseq 1e17
63999999