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 A091631 #10 Mar 18 2018 04:00:10 %S A091631 29,227,2237,22229,222247,2222239,22222253,222222227,2222222243, %T A091631 22222222273,222222222301,2222222222243,22222222222229, %U A091631 222222222222227,2222222222222281,22222222222222301,222222222222222281 %N A091631 Next prime associated with A091628. %C A091631 Sequence arising in _Farideh Firoozbakht_'s solution to Prime Puzzle 251 - 23 is the only pointer prime (A089823) not containing the digit "1". %C A091631 The monotonically increasing value of successive product of digits (A091629) strongly suggests that in successive n the digit 1 must be present. %H A091631 Carlos Rivera's Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/puzzles/puzz_251.htm">Puzzle 251, Pointer primes</a> %F A091631 a(n) = A007918(A091628(n)+1). %e A091631 a(1) = nextprime(23+1) = 29. %o A091631 (PARI) a(n) = nextprime((10^(n+1) - 1)/9*2 + 2); \\ _Michel Marcus_, Mar 18 2018 %Y A091631 Cf. A007918, A089823, A091628, A091629, A091630, A091632. %K A091631 base,easy,nonn %O A091631 1,1 %A A091631 _Enoch Haga_, Jan 24 2004 %E A091631 Edited and extended by _Ray Chandler_, Feb 07 2004