Smallest composite c where exactly n composites d with d < c exist such that c^(d-1) == 1 (mod d) and d^(c-1) == 1 (mod c).
A270575
Smallest composite c where exactly n composites d with d < c exist such that c^(d-1) == 1 (mod d) and d^(c-1) == 1 (mod c).
Terms
- a(0) =9a(1) =55a(2) =85a(3) =259a(4) =781a(5) =91a(6) =2737a(7) =451a(8) =645a(9) =341a(10) =481a(11) =703a(12) =4005a(13) =4369a(14) =4371a(15) =2071a(16) =7957a(17) =8695a(18) =561a(19) =6697a(20) =15251a(21) =7107a(22) =16705a(23) =3201a(24) =34133a(25) =31609a(26) =3277a(27) =1105a(28) =16589a(29) =1891
External references
- oeis: A270575