A359151 Numbers of the form 4u+1 with an odd number of prime factors (counted with multiplicity).

5, 13, 17, 29, 37, 41, 45, 53, 61, 73, 89, 97, 101, 105, 109, 113, 117, 125, 137, 149, 153, 157, 165, 173, 181, 193, 197, 229, 233, 241, 245, 257, 261, 269, 273, 277, 281, 285, 293, 313, 317, 325, 333, 337, 345, 349, 353, 357, 369, 373, 385, 389, 397, 401, 405, 409, 421, 425, 429, 433, 449, 457, 461

Offset: 1

Author

Antti Karttunen, Dec 17 2022

Keywords

• nonn

Crossrefs

Intersection of A016813 and A026424.

Setwise difference A067019 \ A359153.

Setwise difference A016813 \ A359161.

Cf. A002144, A191218 (subsequences).

Cf. A359150 (characteristic function).

Programs

PARI

isA359151(n) = A359150(n);