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 A262555 #14 Nov 04 2018 18:21:57 %S A262555 3,41,103,1713,2769 %N A262555 Numbers n such that the concatenation of the decimal numbers 1 through n, but omitting 2, is a prime. %C A262555 The corresponding primes are the primes in A262572. Probabilistic arguments suggest the sequence is infinite. %C A262555 a(6) > 10000, if it exists. - _Robert Price_, Nov 04 2018 %e A262555 The first two terms correspond to the primes 13 and 134567891011121314151617181920212223242526272829303132333435363738394041 (see A262298). %e A262555 a(3) corresponds to a prime ending in 103, with 200 digits, a(4) to a probable prime ending in 1713, with 5744 digits, and a(5) to a probable prime ending in 2769, with 9968 digits. These three terms were found by _David Broadhurst_ on Oct 09 2015. %Y A262555 Cf. A262572, A262298, A007908. %K A262555 nonn,base,more %O A262555 1,1 %A A262555 _N. J. A. Sloane_, Oct 09 2015