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 A095750 #11 Feb 16 2025 08:32:53 %S A095750 0,0,1,2,3,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,3,0,0, %T A095750 0,0,0,0,1,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,1,0,0,0,0,0, %U A095750 0,0,0,1,0,0,0,0,0,0,1,1,0,1,0,1,0,0,0,0,0,0,0,0,0,1,0,1,1,0,0,1,0,0,0,0,0 %N A095750 "Degree" of the Sophie Germain primes (A005384). %C A095750 This sequence is derived from the special case of Cunningham chains of the first kind where every member of the chain is a Sophie Germain prime. %C A095750 This sequence can be obtained by subtracting 2 from A074313 and then deleting all negative members. - _David Wasserman_, Sep 13 2007 %H A095750 C. K. Caldwell, <a href="https://t5k.org/glossary/page.php?sort=CunninghamChain">Cunningham Chains</a>. %H A095750 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CunninghamChain.html">Cunningham Chain</a>. %e A095750 Entries 0, 0, 1, 2, 3 correspond to the Sophie Germain primes 2, 3, 5, 11, 23. 5 is degree 1 because 5 = (2 * 2) + 1 and 2 is also a Sophie Germain prime. Similarly, 11 = (5 * 2) + 1, therefore 11 is degree 2. 23 = (11 * 2) + 1, thus 23 is degree 3 and so on. %Y A095750 Cf. A005384. %K A095750 easy,nonn %O A095750 0,4 %A A095750 _Andrew S. Plewe_, Jul 09 2004 %E A095750 More terms from _David Wasserman_, Sep 13 2007