A332812 Numbers n for which A156552(n) == 2 (mod 3).

3, 6, 7, 12, 13, 14, 19, 24, 26, 27, 28, 29, 35, 37, 38, 43, 48, 52, 53, 54, 56, 58, 61, 63, 65, 70, 71, 74, 75, 76, 79, 86, 89, 95, 96, 101, 104, 106, 107, 108, 112, 113, 116, 117, 122, 126, 130, 131, 139, 140, 142, 143, 145, 147, 148, 150, 151, 152, 158, 163, 165, 171, 172, 173, 175, 178, 181, 185, 190, 192, 193, 199, 202

Offset

1,1

Comments

Contains neither squares nor twice squares.

Links

Antti Karttunen, Table of n, a(n) for n = 1..25000

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
isA332812(n) = (2==(A156552(n)%3));

Crossrefs

Positions of 2's in A329903, of -1's in A332814.

Cf. A156552, A329604, A329609.

Cf. A031215 (a subsequence of prime terms).

Cf. also A332822.

Sequence in context: A004760 A186083 A093906 * A152829 A325430 A104463

Adjacent sequences: A332809 A332810 A332811 * A332813 A332814 A332815

Keyword

nonn

Author

Antti Karttunen, Feb 27 2020

Status

approved