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 A087593 #8 Oct 10 2014 13:49:15 %S A087593 13,29,31,41,47,53,61,79,83,97,101,103,107,109,113,163,227,229,241, %T A087593 263,269,281,307,331,347,367,401,449,463,487,503,509,521,523,541,547, %U A087593 557,563,569,587,601,607,641,647,661,701,709,743,769,787,809,821,823,829 %N A087593 Define dd(n) = the number formed by concatenating the absolute difference of successive digits. Sequence contains primes p such that dd(p) is also prime. (Primes in which the number formed by successive digit difference is also a prime.). %C A087593 Conjecture: Sequence is infinite. Subsidiary sequence: number of n-digit members. %H A087593 Harvey P. Dale, <a href="/A087593/b087593.txt">Table of n, a(n) for n = 0..1000</a> %e A087593 29 is a member as absolute(2-9) = 7 is a prime. %e A087593 101 is a member as 1~0= 1, 0~1 = 1 and dd(101) = 11 is a prime. %t A087593 Select[Prime[Range[200]],PrimeQ[FromDigits[Abs[Differences[ IntegerDigits[ #]]]]]&] (* _Harvey P. Dale_, Oct 10 2014 *) %Y A087593 Cf. A087594, A087595. %K A087593 base,nonn %O A087593 0,1 %A A087593 _Amarnath Murthy_, Sep 18 2003 %E A087593 More terms from _David Wasserman_, Jun 15 2005