A354144 Prime powers together with semiprimes.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 32, 33, 34, 35, 37, 38, 39, 41, 43, 46, 47, 49, 51, 53, 55, 57, 58, 59, 61, 62, 64, 65, 67, 69, 71, 73, 74, 77, 79, 81, 82, 83, 85, 86, 87, 89, 91, 93, 94, 95, 97, 101, 103, 106, 107, 109, 111, 113, 115, 118, 119, 121, 122, 123, 125, 127, 128, 129, 131, 133, 134, 137

Offset

1,2

Comments

Union of A000961 and A001358.

Although this is 1 together with A102466, it has arisen sufficiently often that it deserves its own entry.

Links

N. J. A. Sloane, Table of n, a(n) for n = 1..10000

Maple

isPPorSP := proc(n) if n=1 or nops(numtheory[factorset](n)) = 1 or numtheory[bigomega](n) = 2 then 'true' else 'false'; fi; end;

Crossrefs

Cf. A000961, A001221, A001222, A001358, A102466.

Sequence in context: A085156 A342522 A102466 * A322547 A325202 A338973

Adjacent sequences: A354141 A354142 A354143 * A354145 A354146 A354147

Keyword

nonn

Author

N. J. A. Sloane, May 20 2022

Status

approved