OFFSET
1,1
COMMENTS
Numbers k such that A013939(k) = sigma(k).
EXAMPLE
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.
MATHEMATICA
s=0; Do[s=s+PrimeNu[n]; If[DivisorSigma[1, n]==s, Print[n]], {n, 2, 160908}]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Metin Sariyar, Jul 16 2021
EXTENSIONS
a(5) from Martin Ehrenstein, Aug 22 2021
STATUS
approved