A374467 - OEIS

A374467

Numbers that are products of an odd number of primes and the total number of 1-bits in the exponents of their prime factorization n is odd.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 30, 31, 37, 41, 42, 43, 47, 53, 59, 61, 66, 67, 70, 71, 72, 73, 78, 79, 83, 89, 97, 101, 102, 103, 105, 107, 108, 109, 110, 113, 114, 127, 128, 130, 131, 137, 138, 139, 149, 151, 154, 157, 163, 165, 167, 170, 173, 174, 179, 180, 181, 182, 186, 190, 191, 192, 193, 195, 197, 199

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..12000

FORMULA

{k | A001222(k) is odd and A064547(k) is odd}.

PROG

(PAR) isA374467 = A374466;

CROSSREFS

Cf. A001222, A064547, A374466 (characteristic function).

Intersection of A000028 and A026424.