422659domain: NAppears in sequencesPseudoprimes whose prime factors do not divide any smaller pseudoprime.at n=13A084653For 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=36A085999Pseudoprimes to base 2 of the form 4k+3.at n=20A177884