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 A114784 #16 Jul 06 2019 14:20:33 %S A114784 0,23,0,227,211,2213, %T A114784 22222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222217, %U A114784 2222219,223,229,2222222222222222222222222231,2237,241,2243,22247 %N A114784 Smallest prime of the form: all twos followed by prime(n). a(n) > prime(n). 0 if no such prime exists. %C A114784 Prime(n) is all zeros followed by prime(n). This is all twos followed by prime(n). Conjecture: No term is zero except a(1) = a(3) = 0. %C A114784 a(6) has not been proved prime, but it is a probable prime. - _Joshua Zucker_, May 06 2006 %C A114784 The 206-digit number 222...217 is, in fact, prime, as quickly confirmed by the Magma Calculator (http://magma.maths.usyd.edu.au/calc/). - _Jon E. Schoenfield_, Aug 24 2009 %e A114784 a(6) = 2213, as 213 is composite prime(6) = 13. %Y A114784 Cf. A114783. %K A114784 base,nonn %O A114784 1,2 %A A114784 _Amarnath Murthy_, Nov 17 2005 %E A114784 More terms from _Joshua Zucker_, May 06 2006 %E A114784 Edited by _T. D. Noe_, Oct 30 2008