A067877 - OEIS

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A067877

Numbers n such that sigma(n)=phi(n*bigomega(n)-1).

%I #8 Jan 16 2023 12:50:05

%S 1,10,33,46,65,77,123,221,371,385,545,753,1643,2033,2635,3243,4311,

%T 4533,4798,5177,5495,5605,7463,7565,7683,7739,8201,9741,11679,13039,

%U 13623,17147,17663,18067,18695,23038,23335,24215,27231,28495,31403

%N Numbers n such that sigma(n)=phi(n*bigomega(n)-1).

%t Select[Range[32000],DivisorSigma[1,#]==EulerPhi[# PrimeOmega[#]-1]&] (* _Harvey P. Dale_, Jan 16 2023 *)

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, Mar 02 2002