A368999 - OEIS

A368999

Numbers k for which A342001(k) is odd.

2, 3, 5, 6, 7, 8, 10, 11, 13, 14, 17, 18, 19, 22, 23, 24, 26, 27, 29, 30, 31, 32, 34, 37, 38, 40, 41, 42, 43, 45, 46, 47, 50, 53, 54, 56, 58, 59, 61, 62, 63, 66, 67, 70, 71, 72, 73, 74, 75, 78, 79, 82, 83, 86, 88, 89, 90, 94, 96, 97, 98, 99, 101, 102, 103, 104, 105, 106, 107, 109, 110, 113, 114, 117, 118, 120, 122, 125

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..78.

PROG

(PARI)

A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));

A003557(n) = (n/factorback(factorint(n)[, 1]));

A342001(n) = (A003415(n) / A003557(n));

isA368999(n) = (A342001(n)%2);

CROSSREFS