Pseudoprimes k to base 2 such that k-2 and k+2 are primes.

Terms

a(0) =645a(1) =25761a(2) =212421a(3) =332949a(4) =656601a(5) =6212361a(6) =63560685a(7) =413435121a(8) =1112691009a(9) =1121315385a(10) =1239702465a(11) =2851612221a(12) =5616154545a(13) =6454103601a(14) =6689540901a(15) =9691152801a(16) =9728582781a(17) =11970358401a(18) =12028438605a(19) =15076352901a(20) =17402551365