57181domain: NAppears in sequencesStrong pseudoprimes to base 100.at n=39A020326"BGJ" (reversible, element, labeled) transform of 2,1,1,1...at n=9A032053L.g.f.: -log(1 - Sum_{n>=1} x^(n*(n+1)/2)) = Sum_{n>=1} a(n)*x^n/n.at n=24A224678a(n) = A224678(n^2).at n=4A224680