a(n) is the first term p in a sequence of primes such that p+4m^2 is prime for m = 0 to n, but composite for m = n+1; a(n) = -1 if no such prime exists.

A092120

a(n) is the first term p in a sequence of primes such that p+4m^2 is prime for m = 0 to n, but composite for m = n+1; a(n) = -1 if no such prime exists.

Terms

    a(0) =2a(1) =19a(2) =3a(3) =277a(4) =43a(5) =53593a(6) =7a(7) =67a(8) =37a(9) =1483087a(10) =1867783a(11) =9671300983a(12) =376040154163a(15) =409333

External references