Odd integers k such that 7^((k-1)/2) + 1 == 0 (mod k*(k-1)/2).
A337831
Odd integers k such that 7^((k-1)/2) + 1 == 0 (mod k*(k-1)/2).
Terms
- a(0) =5a(1) =101a(2) =62501a(3) =1020101a(4) =3512501a(5) =12650501a(6) =22598021a(7) =31562501a(8) =365328101a(9) =789062501a(10) =11412000101a(11) =64014060101
External references
- oeis: A337831