Least number k > 1 (that is not the power of prime p) such that k divides (p+1)^k-1, where p = prime(n).
A128356
Least number k > 1 (that is not the power of prime p) such that k divides (p+1)^k-1, where p = prime(n).
Terms
- a(0) =20a(1) =21a(2) =1555a(3) =889a(4) =253a(5) =2041a(6) =5846759a(7) =148305659a(8) =1081a(9) =279241a(10) =9641a(11) =950123a(12) =33661a(13) =63213709997a(14) =583223a(15) =3775349a(16) =72707647a(17) =149070763a(18) =196932497a(19) =5091481a(20) =25760459a(22) =13861a(23) =9362711a(24) =376457a(25) =132766545553a(26) =63757
External references
- oeis: A128356