a(n) is the smallest prime p such that p + 6*t is also prime for every triangular number t up to, but not including, the n-th triangular number (or 0 if no such prime exists).

A323740

a(n) is the smallest prime p such that p + 6*t is also prime for every triangular number t up to, but not including, the n-th triangular number (or 0 if no such prime exists).

Terms

    a(0) =2a(1) =7a(2) =13a(3) =5a(4) =53a(5) =1033a(6) =821a(7) =10133a(8) =9461a(9) =11a(10) =105276481a(11) =2201568973a(12) =35401

External references