251025domain: NAppears in sequencesNumbers k such that 245*2^k+1 is prime.at n=33A032499If n is composite replace n with the concatenation of its nontrivial divisors [ A037279 ] then divide out any factors of 2.at n=49A037280Row sums in A084024.at n=4A084027a(n) is the concatenation of its nontrivial divisors.at n=49A106708