Numbers k such that sigma(k) - k = k - pi(k) - 1 where pi(k) is A000720.

A048884

Numbers k such that sigma(k) - k = k - pi(k) - 1 where pi(k) is A000720.

Terms

    a(0) =1a(1) =5a(2) =9a(3) =26a(4) =236a(5) =244a(6) =4862a(7) =5396a(8) =6868a(9) =9608a(10) =9704a(11) =23764a(12) =82665a(13) =733064a(14) =25881904a(15) =25886864a(16) =33299110a(17) =261851668

External references