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 A308810 #14 Apr 06 2020 00:42:17 %S A308810 187,323,427,549,559,687,721,779,781,927,937,965,973,1003,1131,1157, %T A308810 1203,1227,1243,1371,1411,1457,1477,1501,1561,1563,1647,1707,1721, %U A308810 1827,1831,1939,1957,2021,2057,2061,2093,2101,2123,2149,2283,2329,2345,2365,2443,2449,2533,2571,2611,2623,2653,2671,2747,2755 %N A308810 Odd positive integers k such that the repetend of the binary representation of 1/k contains more 1's than 0's. %C A308810 The first prime in the sequence is 937. If a prime number p occurs in the sequence, then the repetend of the binary representation of 1/p is necessarily of odd length. %e A308810 For example, 1/187 = 0.[0000000101011110011101011011101110001101]_2, where the bracketed repetend includes 21 ones and 19 zeros. Therefore, 187 is in the sequence. %K A308810 base,easy,nonn %O A308810 1,1 %A A308810 _Austin Shapiro_, Jun 25 2019