A354144 - OEIS

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

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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.