Smallest k such that 6^^n is not congruent to 6^^(n-1) mod k, where 6^^n denotes the power tower 6^6^...^6 (in which 6 appears n times).
A246494
Smallest k such that 6^^n is not congruent to 6^^(n-1) mod k, where 6^^n denotes the power tower 6^6^...^6 (in which 6 appears n times).
Terms
- a(0) =2a(1) =4a(2) =13a(3) =47a(4) =107a(5) =643a(6) =1439a(7) =2879a(8) =34549a(9) =138197a(10) =858239a(11) =2029439a(12) =36449279
External references
- oeis: A246494