228154

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 38.at n=22A031626
• a(n) is the action of recursively applying 'Rule 30' elementary cellular automata on the binary representation of n if the cells may only expand into the significant bit, a(0) = 1.at n=17A074890