158237domain: NAppears in sequencesStrong pseudoprimes to base 22.at n=29A020248Strong pseudoprimes to base 91.at n=30A020317Denominators of continued fraction convergents to sqrt(55).at n=10A041095Denominators of continued fraction convergents to sqrt(220).at n=10A041411a(n) = 1 + 4*n*(1 + 2*n^2)/3.at n=39A171272