This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A248379 #18 Oct 16 2014 00:31:40 %S A248379 2,4,8,14,16,32,64,128,122,244,256,512,866,1024,1766,2048,4006,4096, %T A248379 8192,8482,12242,16384,32768,52586,65536,105806,131072 %N A248379 Even terms in A247665 in order of appearance. %C A248379 What are the terms that are not powers of 2? %D A248379 _Amarnath Murthy_, Email to _N. J. A. Sloane_, Oct 05 2014. %e A248379 Table (extracted from Russ Cox's extended table in A247665) showing index where even numbers appear, the even number, and the number of different prime factors of that term: %e A248379 3 4 1 %e A248379 7 8 1 %e A248379 15 14 2 %e A248379 31 16 1 %e A248379 63 32 1 %e A248379 127 64 1 %e A248379 255 128 1 %e A248379 511 122 2 %e A248379 1023 244 2 %e A248379 2047 256 1 %e A248379 4095 512 1 %e A248379 8191 866 2 %e A248379 16383 1024 1 %e A248379 32767 1766 2 %e A248379 65535 2048 1 %e A248379 131071 4006 2 %e A248379 262143 4096 1 %e A248379 524287 8192 1 %e A248379 1048575 8482 2 %e A248379 2097151 12242 2 %e A248379 4194303 16384 1 %e A248379 8388607 32768 1 %e A248379 16777215 52586 2 %e A248379 33554431 65536 1 %e A248379 67108863 105806 2 %e A248379 134217727 131072 1 %e A248379 ... %Y A248379 Cf. A247665, A248381, A248387, A248388. %K A248379 nonn,more %O A248379 1,1 %A A248379 _N. J. A. Sloane_, Oct 08 2014 %E A248379 More terms from _Russ Cox_, Oct 11 2014