A067762 Numbers n such that bigomega(sigma(n))=bigomega(n).

1, 2, 12, 20, 24, 40, 45, 49, 52, 75, 90, 98, 104, 108, 117, 121, 148, 150, 169, 216, 224, 234, 242, 244, 252, 292, 296, 325, 333, 336, 338, 352, 361, 368, 396, 480, 488, 500, 504, 528, 529, 544, 549, 560, 567, 584, 588, 608, 612, 628, 650, 657, 666, 675, 684

Offset

1,2

Comments

So, also numbers such that bigomega(numerator(sigma(n)/n)) = bigomega(denominator(sigma(n)/n)), that is, A001222(A017665(n)) = A001222(A017666(n)). - Michel Marcus, Apr 20 2014

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[1000], PrimeOmega[DivisorSigma[1, #]]==PrimeOmega[#]&] (* Harvey P. Dale, Oct 15 2012 *)

Crossrefs

Cf. A000203, A001222.

Sequence in context: A121022 A277589 A069164 * A305162 A339709 A137311

Adjacent sequences: A067759 A067760 A067761 * A067763 A067764 A067765

Keyword

nonn

Author

Benoit Cloitre, Feb 06 2002

Status

approved