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

Author

Antti Karttunen, Feb 27 2020

Keywords

• nonn

Comments

Contains neither squares nor twice squares.

Links

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

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.

Programs

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));