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 A206473 #17 Aug 18 2025 00:09:45 %S A206473 7,199,1129,1327,19609,19609,31397,155921,360653,370261,370261, %T A206473 1349533,1357201,1561919,2010733,15203977,17051707,17051707,20831323, %U A206473 20831323,20831323,47326693,189695659,189695659,191912783,436273009,436273009,436273009,436273009 %N A206473 First prime in A122072 that appears at least n times. %C A206473 Corresponding values of n in A122072 are 1, 21, 115, 136, 1965, 1966, .... %H A206473 <a href="/index/Pri#gaps">Index entries for primes, gaps between</a>. %o A206473 (PARI) a(n)=my(p=2);forprime(q=3,default(primelimit),if(q\10-p\10>=n,return(p));p=q) \\ _Charles R Greathouse IV_, Feb 26 2012 %Y A206473 Cf. A122384, A122390. %K A206473 nonn %O A206473 1,1 %A A206473 _Lekraj Beedassy_, Feb 08 2012 %E A206473 a(5)-a(15) from _Alois P. Heinz_, Feb 08 2012 %E A206473 a(16)-a(36) from _Charles R Greathouse IV_, Feb 26 2012