Composite numbers k such that sigma(k)/k' is an integer, where k' is the arithmetic derivative of k.
A321182
Composite numbers k such that sigma(k)/k' is an integer, where k' is the arithmetic derivative of k.
Terms
- a(0) =15a(1) =35a(2) =45a(3) =95a(4) =119a(5) =143a(6) =209a(7) =287a(8) =319a(9) =323a(10) =377a(11) =527a(12) =559a(13) =693a(14) =779a(15) =899a(16) =923a(17) =989a(18) =1007a(19) =1189a(20) =1199a(21) =1343a(22) =1349a(23) =1763a(24) =1919a(25) =2159a(26) =2507a(27) =2759a(28) =2911a(29) =3239
External references
- oeis: A321182