315652domain: NAppears in sequencesa(n) = floor(log_10(2^(2^n))).at n=19A129784Lexicographically earliest infinite sequence such that (a(i)-a(j)) mod (a(k)-a(j)) is nonzero whenever i,j,k are disjoint.at n=24A178850Convolution of A000219 and A001477.at n=20A360489