a(n) is the least prime p such that p + 8*k*(k+1) is prime for 0 <= k <= n-1 but not for k=n.
A378839
a(n) is the least prime p such that p + 8*k*(k+1) is prime for 0 <= k <= n-1 but not for k=n.
Terms
- a(0) =2a(1) =3a(2) =151a(3) =181a(4) =13a(5) =811a(6) =23671a(7) =92221a(8) =45417481a(9) =5078503a(10) =4861a(11) =20379346831a(12) =12180447943a(13) =31
External references
- oeis: A378839