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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Happy-numbers/FALSE/happy-numbers.false Normal file
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[$10/$10*@\-$*\]m: {modulo squared and division}
[$m;![$9>][m;!@@+\]#$*+]s: {sum of squares}
[$0[1ø1>][1ø3+ø3ø=|\1-\]#\%]f: {look for duplicates}
{check happy number}
[
$1[f;!~2ø1=~&][1+\s;!@]# {loop over sequence until 1 or duplicate}
1ø1= {return value}
\[$0=~][@%1-]#% {drop sequence and counter}
]h:
0 1
"Happy numbers:"
[1ø8=~][h;![" "$.\1+\]?1+]#
%%