Numbers k such that sigma(k+1) - sigma(k) = sigma(k)/d(k), where d(k) denotes the number of divisors of k.

A066176

Numbers k such that sigma(k+1) - sigma(k) = sigma(k)/d(k), where d(k) denotes the number of divisors of k.

Terms

    a(0) =135a(1) =147a(2) =189a(3) =753a(4) =2697a(5) =8365a(6) =14577a(7) =16929a(8) =18573a(9) =21093a(10) =38481a(11) =67461a(12) =69285a(13) =99237a(14) =100497a(15) =108134a(16) =144555a(17) =148173a(18) =186081a(19) =253761a(20) =263906a(21) =302589a(22) =536834a(23) =560733a(24) =680043a(25) =1158717a(26) =1239554a(27) =1418121a(28) =1431861a(29) =1520313

External references