A073567 Numbers n such that sigma(n) = phi(n)*omega(n).

35, 357, 3135, 3339, 5049, 20026, 23374, 25714, 33915, 35074, 35343, 39105, 39585, 55154, 56134, 71145, 124605, 157586, 316274, 317205, 373065, 423045, 435435, 474548, 479655, 559845, 596666, 604012, 696514, 711988, 819772, 1123605, 1161508, 1277788, 1491412

Offset

1,1

Links

Donovan Johnson, Table of n, a(n) for n = 1..1000

Mathematica

t = {}; Do[If[DivisorSigma[1, n] == EulerPhi[n]*PrimeNu[n], AppendTo[t, n]], {n, 700000}]; t (* Jayanta Basu, Jul 01 2013 *)
Select[Range[15*10^5], DivisorSigma[1, #]==EulerPhi[#]PrimeNu[#]&] (* Harvey P. Dale, Mar 04 2023 *)

Prog

(PARI) for(n=1, 10000000, if(sigma(n)==eulerphi(n)*omega(n), print1(n, ", "))) (Klasen)

Crossrefs

Cf. A000010, A000203, A001221.

Sequence in context: A101099 A027803 A267749 * A225697 A133458 A238539

Adjacent sequences: A073564 A073565 A073566 * A073568 A073569 A073570

Keyword

easy,nonn

Author

Benoit Cloitre, Aug 31 2002

Extensions

More terms from Lambert Klasen (lambert.klasen(AT)gmx.de), Dec 23 2004

Status

approved