Apocalyptic powers: 2^a(n) contains 666.

Terms

a(0) =157a(1) =192a(2) =218a(3) =220a(4) =222a(5) =224a(6) =226a(7) =243a(8) =245a(9) =247a(10) =251a(11) =278a(12) =285a(13) =286a(14) =287a(15) =312a(16) =355a(17) =361a(18) =366a(19) =382a(20) =384a(21) =390a(22) =394a(23) =411a(24) =434a(25) =443a(26) =478a(27) =497a(28) =499a(29) =506