A323520 - OEIS

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A323520

Numbers of the form p^(k^2) where p is prime and k >= 0.

1, 2, 3, 5, 7, 11, 13, 16, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 81, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..59.

MATHEMATICA

Select[Range[100], #==1||PrimePowerQ[#]&&IntegerQ[Sqrt[FactorInteger[#][[1, 2]]]]&]

CROSSREFS

Cf. A000290, A000961, A001248, A001597, A026478, A050376, A277562, A323519, A323526, A323528.

Sequence in context: A154893 A084111 A171474 * A176548 A020625 A033633

Adjacent sequences: A323517 A323518 A323519 * A323521 A323522 A323523

KEYWORD

nonn

AUTHOR

Gus Wiseman, Jan 17 2019

STATUS

approved