76861domain: NAppears in sequencesStrong pseudoprimes to base 39.at n=28A020265Strong pseudoprimes to base 41.at n=27A020267Integers k such that for all m>k, d(m)/m < d(k)/k where d(j) = Min_{p & q odd primes, 2*j = p+q, p <= q} (q-p)/2.at n=31A335297