A369966 - OEIS

A369966

Numbers of the form 4m+2 that have an even number of prime factors with multiplicity.

6, 10, 14, 22, 26, 34, 38, 46, 54, 58, 62, 74, 82, 86, 90, 94, 106, 118, 122, 126, 134, 142, 146, 150, 158, 166, 178, 194, 198, 202, 206, 210, 214, 218, 226, 234, 250, 254, 262, 274, 278, 294, 298, 302, 306, 314, 326, 330, 334, 342, 346, 350, 358, 362, 382, 386, 390, 394, 398, 414, 422, 446, 454, 458, 462, 466

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

OFFSET

1,1

COMMENTS

Numbers that have one even prime factor (2) and an odd number of odd prime factors with multiplicity.

Numbers that have an even number of prime factors with multiplicity and whose arithmetic derivative (A003415) is odd.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = 2*A067019(n).

PROG

(PARI) \\ See A369965