Numbers n such that sigma(n) + sigma(n-1) = 3n, where sigma(n) = sum of divisors of n (A000203).

A222174

Numbers n such that sigma(n) + sigma(n-1) = 3n, where sigma(n) = sum of divisors of n (A000203).

Terms

    a(0) =6a(1) =34a(2) =50a(3) =236a(4) =262a(5) =386a(6) =898a(7) =8362a(8) =26938a(9) =46594a(10) =80876a(11) =5244548a(12) =5462384a(13) =17062316a(14) =323987588a(15) =1162300834a(16) =1381439876

External references