Numbers k such that Sum_{i=1..k} i^tau(i) == 0 (mod k), where tau(i) = A000005(i), the number of divisors of i.
A229095
Numbers k such that Sum_{i=1..k} i^tau(i) == 0 (mod k), where tau(i) = A000005(i), the number of divisors of i.
Terms
- a(0) =1a(1) =8a(2) =9a(3) =67a(4) =72a(5) =467a(6) =801a(7) =1071a(8) =5141a(9) =7193a(10) =25688a(11) =68488a(12) =97768a(13) =111816a(14) =381061a(15) =7829505a(16) =17079937a(17) =25615576a(18) =44582211a(19) =91110856a(20) =639359784a(21) =3492789629
External references
- oeis: A229095