

A329604


Numbers k such that A156552(k) == 1 (mod 3); numbers k for which A156552(2*k) is a multiple of 3.


9



2, 5, 8, 11, 15, 17, 18, 20, 23, 31, 32, 33, 41, 42, 44, 45, 47, 50, 51, 59, 60, 67, 68, 69, 72, 73, 77, 78, 80, 83, 92, 93, 97, 98, 99, 103, 109, 110, 114, 119, 123, 124, 125, 127, 128, 132, 135, 137, 141, 149, 153, 157, 161, 162, 164, 167, 168, 170, 174, 176, 177, 179, 180, 182, 188, 191, 197, 200, 201, 204, 207, 210, 211, 217, 219, 221, 222
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Even terms of A329609, divided by two.
Numbers k for which A156552(k) == 1 (mod 3).  Antti Karttunen, Feb 27 2020


LINKS

Antti Karttunen, Table of n, a(n) for n = 1..20000


PROG

(PARI)
A156552(n) = {my(f = factor(n), p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1])  1); res += (p * p2 * (2^(f[i, 2])  1)); p2 <<= f[i, 2]); res}; \\ From A156552
isA329604(n) = !(A156552(2*n)%3);


CROSSREFS

Sequence A329603 sorted into ascending order.
Positions of 1's in A329903 and in A332814.
Cf. A156552, A329609.
Cf. A001105 (subsequence apart from the initial 0).
Cf. A031368 (a subsequence of prime terms).
Cf. also A332812, A324814, A332821.
Sequence in context: A173698 A162938 A118518 * A190079 A184872 A163249
Adjacent sequences: A329601 A329602 A329603 * A329605 A329606 A329607


KEYWORD

nonn


AUTHOR

Antti Karttunen, Nov 21 2019


EXTENSIONS

New primary definition added by Antti Karttunen, Mar 01 2020


STATUS

approved



