A079713 Numbers k such that bigomega(sigma(k)) = sigma(bigomega(k)).

2, 6, 10, 26, 27, 28, 44, 63, 68, 74, 76, 99, 116, 120, 122, 125, 146, 147, 153, 164, 171, 172, 175, 189, 245, 248, 261, 268, 275, 276, 297, 308, 312, 314, 363, 369, 376, 386, 387, 388, 390, 404, 425, 436, 452, 459, 460, 475, 476, 496, 507, 513, 520, 532, 548

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Formula

Numbers k such that A001222(A000203(k)) = A000203(A001222(k)). - Wesley Ivan Hurt, Apr 17 2022

Mathematica

Table[If[PrimeOmega[DivisorSigma[1, n]] == DivisorSigma[1, PrimeOmega[n]], n, {}], {n, 2, 500}] // Flatten (* Wesley Ivan Hurt, Apr 17 2022 *)
Select[Range[550], PrimeOmega[DivisorSigma[1, #]]==DivisorSigma[1, PrimeOmega[ #]]&] (* Harvey P. Dale, Jul 04 2022 *)

Crossrefs

Cf. A000203 (sigma), A001222 (Omega).

Sequence in context: A104142 A258143 A369290 * A055237 A057434 A333170

Adjacent sequences: A079710 A079711 A079712 * A079714 A079715 A079716

Keyword

nonn

Author

Benoit Cloitre, Jan 31 2003

Status

approved