1419607domain: NAppears in sequencesFor p = prime(n), a(n) is the smallest base-2 pseudoprime N (that is, 2^(N-1) = 1 mod N) such that p divides N.at n=32A085999Pseudoprimes to base 2 of the form 4k+3.at n=40A177884Fermat pseudoprimes to base 2 that are pentagonal.at n=2A293623