a(n) is the smallest positive number k such that (product of the first n odd primes) + k^2 is a square.

A349708

a(n) is the smallest positive number k such that (product of the first n odd primes) + k^2 is a square.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =1a(4) =19a(5) =53a(6) =58a(7) =97a(8) =181a(9) =4244a(10) =2122a(11) =31126a(12) =16451a(13) =297392a(14) =2444006a(15) =622249a(16) =2909047a(17) =216182072a(18) =62801719a(19) =769709491a(20) =32522441312a(21) =37859955467a(22) =129549407177a(23) =286721160343a(24) =101419856449

External references