A324552 a(n) = A324542(2*prime(n)).

3, 4, 11, 16, 46, 82, 174, 256, 798, 1300, 2734, 4354, 10926, 20518, 51790, 65536, 174766, 351118, 699054, 1110274, 3100238, 5048230, 11184814, 17041414, 49012990, 82623886, 211053038, 284225794, 727960798, 1494039790, 2863311534, 4301668354, 12611914846, 20788904014, 51322664446, 73234343950, 183355069406, 332019460558

Offset

1,1

Comments

In contrast to A324549 this seems to be monotonic.

Links

Antti Karttunen, Table of n, a(n) for n = 1..669 (based on Hans Havermann's factorization of A156552)

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to sigma(n)

Formula

a(n) = A324542(2*A000040(n)).

a(n) = sigma(2^n + 1) - 2, for n>1. - Ridouane Oudra, Jul 14 2023

Prog

(PARI) A324552(n) = A324542(2*prime(n));

Crossrefs

Cf. A000040, A324536, A324542, A324549.

Sequence in context: A239024 A026676 A142870 * A143680 A058569 A231882

Adjacent sequences: A324549 A324550 A324551 * A324553 A324554 A324555

Keyword

nonn

Author

Antti Karttunen, Mar 12 2019

Status

approved