A358226 - OEIS

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A358226

Numbers k such that A276086(k) mod k is an even number, where A276086 is the primorial base exp-function.

3

1, 3, 11, 15, 17, 25, 27, 31, 43, 51, 57, 59, 63, 71, 75, 77, 83, 85, 87, 93, 95, 103, 105, 107, 109, 115, 119, 129, 133, 137, 139, 145, 147, 151, 157, 167, 169, 171, 173, 175, 177, 185, 189, 191, 199, 201, 207, 211, 213, 215, 217, 221, 223, 229, 233, 235, 237, 241, 257, 259, 263, 269, 281, 289, 299, 303, 305, 307

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OFFSET

1,2

COMMENTS

All terms are odd.

LINKS

Table of n, a(n) for n=1..68.

Index entries for sequences related to primorial base

FORMULA

{k | A328386(k) == 0 (mod 2)}.

PROG

(PARI)

A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };

A358224(n) = ((A276086(n)%n)%2);

isA358226(n) = !A358224(n);

CROSSREFS

Cf. A276086, A328386, A328387 (subsequence), A358225 (complement).

Positions of zeros in A358224.

Cf. also A358229.

Sequence in context: A132363 A134629 A245522 * A030715 A056247 A039275

Adjacent sequences: A358223 A358224 A358225 * A358227 A358228 A358229

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 25 2022

STATUS

approved