A346423 Numbers m such that Sum_{k=1..m} omega(k) = sigma(m).

11, 230, 52830, 160908, 6134334960

Offset: 1

Author

Metin Sariyar, Jul 16 2021

Keywords

• nonn
• more

Comments

Numbers k such that A013939(k) = sigma(k).

Examples

			The sum of number of distinct primes dividing numbers up to 11 is 1+1+1+1+2+1+1+1+2+1 = sigma(11), so 11 is a term.
		

Crossrefs

Cf. A000203, A013939.

Programs

Mathematica

s=0;Do[s=s+PrimeNu[n];If[DivisorSigma[1,n]==s,Print[n]],{n,2,160908}]

Extensions

a(5) from Martin Ehrenstein, Aug 22 2021