A330734 a(n) = n - A309639(n), where A309639(n) is the index of the least harmonic number H_i whose denominator (A002805) is divisible by n.

0, 0, 0, 0, 0, 3, 0, 0, 0, 5, 0, 8, 0, 7, 10, 0, 0, 9, 0, 15, 12, 11, 0, 15, 0, 13, 0, 21, 0, 25, 0, 0, 22, 17, 28, 27, 0, 19, 26, 32, 0, 33, 0, 33, 36, 23, 0, 32, 0, 25, 34, 39, 0, 27, 44, 48, 38, 29, 0, 55, 0, 31, 54, 0, 52, 55, 0, 51, 45, 63, 0, 63, 0, 37, 50, 57, 66, 65, 0, 64, 0, 41, 0, 75, 68, 43, 58, 77, 0, 81

Offset

1,6

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Formula

a(n) = n - A309639(n).

Prog

(PARI) A330734(n) = (n-A309639(n));

Crossrefs

Cf. A000961 (indices of zeros), A309639, A330691, A330692, A330735.

Sequence in context: A245552 A195938 A184762 * A081805 A333784 A181189

Adjacent sequences: A330731 A330732 A330733 * A330735 A330736 A330737

Keyword

nonn

Author

Antti Karttunen, Jan 10 2020

Status

approved