a(n) is the smallest suffix such that the numbers with k digits "6" prepended are primes for k = 1, 2, ..., n but not for k = n+1.

A350216

a(n) is the smallest suffix such that the numbers with k digits "6" prepended are primes for k = 1, 2, ..., n but not for k = n+1.

Terms

    a(0) =7a(1) =19a(2) =1a(3) =173a(4) =1547a(5) =559667a(6) =347707a(7) =36695077a(8) =139760989a(9) =7931271479

External references