Numbers n such that Sum_{i=1..n} (i')^i == 0 (mod n), where i' is the arithmetic derivative of i.
A227848
Numbers n such that Sum_{i=1..n} (i')^i == 0 (mod n), where i' is the arithmetic derivative of i.
Terms
- a(0) =1a(1) =9a(2) =71a(3) =120a(4) =331a(5) =393a(6) =728a(7) =1223a(8) =3697a(9) =4123a(10) =6791a(11) =7391a(12) =23911a(13) =25099a(14) =35287a(15) =86442a(16) =86716a(17) =118034a(18) =292411a(19) =352970a(20) =527255a(21) =606425
External references
- oeis: A227848