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

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

Cf. A342001.

Positions of 0's in A368997. Cf. A368999 (complement).

Sequence in context: A072510 A084116 A137620 * A336487 A028765 A181807

Adjacent sequences: A368996 A368997 A368998 * A369000 A369001 A369002

Keyword

nonn

Author

Antti Karttunen, Jan 14 2024

Status

approved