Rem: Duplicate primes are summed up: e.g. 12 = 2*2*3, - so the sum of 12's prime factors is 2+2+3=7.

Bonus question: Any others?

Bonus question: @OEIS A070311 Numbers n such that sopfr(n) and d(n) are both perfect numbers.

blackjack

flooble's webmaster puzzle