A359153 Numbers of the form 4u+3 with an odd number of prime factors (counted with multiplicity).

3, 7, 11, 19, 23, 27, 31, 43, 47, 59, 63, 67, 71, 75, 79, 83, 99, 103, 107, 127, 131, 139, 147, 151, 163, 167, 171, 175, 179, 191, 195, 199, 207, 211, 223, 227, 231, 239, 243, 251, 255, 263, 271, 275, 279, 283, 307, 311, 331, 343, 347, 359, 363, 367, 379, 383, 387, 399, 419, 423, 431, 435, 439, 443

Offset: 1

Author

Antti Karttunen, Dec 17 2022

Keywords

• nonn

Crossrefs

Intersection of A004767 and A026424.

Setwise difference A067019 \ A359151.

Setwise difference A004767 \ A359163.

Cf. A002145 (subsequence).

Cf. A359152 (characteristic function).

Programs

Mathematica

Select[4*Range[0,150]+3,OddQ[PrimeOmega[#]]&] (* Harvey P. Dale, Jun 01 2025 *)

PARI

isA359153(n) = A359152(n);