A324549 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A324549

a(n) = A324543(2*A000040(n)).

3

3, 2, 5, 2, 16, 20, 48, 2, 288, 278, 688, 260, 2736, 4136, 19024, 2, 43696, 88976, 174768, 61700, 1003088, 853928, 2796208, 264200, 15458560, 15515024, 76835312, 15790340, 191089888, 420297968, 715827888, 6701060, 4021980256, 3609034832, 16962926080, 4514867216, 45916115936, 57141553616, 244626722384, 4278255620

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Term 2 occurs (at least) at n = 2, 4, 8 and 16. See A019434.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..331

FORMULA

a(n) = A324543(2*A000040(n)).

a(n) = sigma(2^n + 1) - 2^n, for n>1. - Ridouane Oudra, Jul 15 2023

PROG

(PARI) A324549(n) = A324543(2*prime(n));

CROSSREFS

Cf. A000040, A000051, A000079, A000203, A019434, A324543.

Sequence in context: A120842 A319044 A230820 * A152178 A274164 A103340

Adjacent sequences: A324546 A324547 A324548 * A324550 A324551 A324552

KEYWORD

nonn

AUTHOR

Antti Karttunen, Mar 07 2019

STATUS

approved