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 A237495 #29 Aug 09 2025 12:55:33 %S A237495 41887255409,364223689829,376655795669,790031896499,1558600513469, %T A237495 2180283962009,3266149150109,4424063189699,4655123392919, %U A237495 6924093600269,7706450161409,9792446379869,14825914106849,15049625144399,15612571518389,18228407987789,20440411077239 %N A237495 Primes which start a Cunningham chain of length 5 where every prime in the chain is the smaller of a pair of twin primes. %C A237495 This is subset of the sequence A236443. Of the first 10000 terms in the sequence A236443 only 48 have length 5. %C A237495 a(n) generates a Cunningham chain of length 5 and a_n(i) + 2 is also prime for i = 1,2,3,4 and 5. %C A237495 This sequence is infinite under Dickson's conjecture. %H A237495 David Radcliffe, <a href="/A237495/b237495.txt">Table of n, a(n) for n = 1..284</a> (terms 1..48 from Abhiram R Devesh). %H A237495 Chris Caldwell, <a href="https://t5k.org/glossary/xpage/CunninghamChain.html">Cunningham Chain</a> %e A237495 a(1) = 41887255409, with associated Cunningham chain of length 5: 41887255409, 83774510819, 167549021639, 335098043279, 670196086559, each of which is the smaller of a pair of twin primes. %o A237495 (C++) // See b-file. %Y A237495 Cf. A178421, A005602, A236443 is a superset of this sequence. %K A237495 nonn %O A237495 1,1 %A A237495 _Abhiram R Devesh_, Feb 08 2014 %E A237495 a(11)-a(17) from _David Radcliffe_, Aug 09 2025