A358225 Numbers k such that A276086(k) mod k is an odd number, where A276086 is the primorial base exp-function.

2, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 16, 18, 19, 20, 21, 22, 23, 24, 26, 28, 29, 30, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 55, 56, 58, 60, 61, 62, 64, 65, 66, 67, 68, 69, 70, 72, 73, 74, 76, 78, 79, 80, 81, 82, 84, 86, 88, 89, 90, 91, 92, 94, 96, 97, 98, 99, 100, 101

Offset

1,1

Links

Table of n, a(n) for n=1..80.

Index entries for sequences related to primorial base

Formula

{k | A328386(k) == 1 (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);
isA358225(n) = A358224(n);

Crossrefs

Cf. A000035, A005843 (subsequence after 0), A276086, A328386, A358225 (characteristic function), A358226 (complement), A358231 (subsequence).

Cf. also A358228.

Sequence in context: A374486 A039246 A201997 * A039158 A030771 A026509

Adjacent sequences: A358222 A358223 A358224 * A358226 A358227 A358228

Keyword

nonn

Author

Antti Karttunen, Nov 25 2022

Status

approved