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 A138005 #8 Jul 15 2025 00:59:35 %S A138005 17,41,73,97,109,113,137,193,229,241,257,277,331,337,353,397,433,449, %T A138005 571,577,631,641,673,683,733,769,953,997,1009,1013,1021,1033,1051, %U A138005 1069,1093,1103,1153,1181,1201,1217,1297,1321,1361,1429,1489,1597,1601,1613,1657,1709,1789,1801,1831,1873,1889,1933,2011,2017,2081,2113,2137,2143,2153,2161,2179,2273,2297,2341,2381,2441,2521,2593,2617,2633 %N A138005 Odd prime numbers p for which not all nontrivial cycles of the Ducci map on p-tuples modulo 2 have the same length. %C A138005 Primes p such that A111944(p) > 2. - _Max Alekseyev_, Jul 10 2025 %Y A138005 Cf. A038553, A111944, A138004. %K A138005 nonn %O A138005 1,1 %A A138005 _T. D. Noe_, Feb 26 2008 %E A138005 a(8)-a(74) from _Max Alekseyev_, Jul 10 2025