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 A110915 #4 Oct 31 2013 12:17:29 %S A110915 17,28961,4598708691828421,1747509302894800001, %T A110915 8603990361433692835766763032506384134769654780784715495311087517908153547994512075361554378508046501 %N A110915 Primes in sequence a(n) = n*a(n-1) + 1, a(1) = 0 (A056542). %H A110915 Tom Mueller, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL8/Mueller/mueller6.pdf">Prime and Composite Terms in Sloane's Sequence A056542</a>, Journal of Integer Sequences, Vol. 8 (2005), Article 05.3.3. %t A110915 Select[ FoldList[ #1*#2 + 1 &, 0, Range[2, 100]], PrimeQ[ # ] &] (* _Robert G. Wilson v_ *) %Y A110915 Cf. A056542; indices of a(n) which are primes: A070213. %K A110915 nonn %O A110915 1,1 %A A110915 _Paul Muljadi_, Oct 09 2005 %E A110915 a(5) from _Robert G. Wilson v_, Oct 11 2005