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A079713 Numbers k such that bigomega(sigma(k)) = sigma(bigomega(k)). 1

%I #13 Jul 04 2022 14:09:38

%S 2,6,10,26,27,28,44,63,68,74,76,99,116,120,122,125,146,147,153,164,

%T 171,172,175,189,245,248,261,268,275,276,297,308,312,314,363,369,376,

%U 386,387,388,390,404,425,436,452,459,460,475,476,496,507,513,520,532,548

%N Numbers k such that bigomega(sigma(k)) = sigma(bigomega(k)).

%H Harvey P. Dale, <a href="/A079713/b079713.txt">Table of n, a(n) for n = 1..1000</a>

%F Numbers k such that A001222(A000203(k)) = A000203(A001222(k)). - _Wesley Ivan Hurt_, Apr 17 2022

%t Table[If[PrimeOmega[DivisorSigma[1, n]] == DivisorSigma[1, PrimeOmega[n]], n, {}], {n, 2, 500}] // Flatten (* _Wesley Ivan Hurt_, Apr 17 2022 *)

%t Select[Range[550],PrimeOmega[DivisorSigma[1,#]]==DivisorSigma[1,PrimeOmega[ #]]&] (* _Harvey P. Dale_, Jul 04 2022 *)

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

%K nonn

%O 1,1

%A _Benoit Cloitre_, Jan 31 2003

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Last modified April 25 09:38 EDT 2024. Contains 371967 sequences. (Running on oeis4.)