69554domain: NAppears in sequencesa(0)=1, a(1)=2; a(2n) = 2*a(2n-1)+1; a(2n+1) = a(2n) + x, where x is the least number not yet the difference of two terms.at n=27A111328Numbers k such that (265*10^k - 7)/3 is prime.at n=25A266582Number of cliques in the n-tetrahedral graph.at n=11A289837a(n) = 136*2^n - 78 (n>=0).at n=9A305156