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 A189557 #8 Mar 30 2012 17:22:58 %S A189557 5,7,13,19,41,43,59,73,109,113,139,181,193,227,229,239,251,281,283, %T A189557 293,313,331,347,349,419,461,463,467,487,523,541,557,587,601,607,617, %U A189557 643,653,701,773,829,863,883,919,929,977,1021,1033,1049,1061,1093,1109 %N A189557 Prime numbers n such that x' = n has one solution, where x' is the arithmetic derivative (A003415) of x. %C A189557 The primes in A189481. %H A189557 T. D. Noe, <a href="/A189557/b189557.txt">Table of n, a(n) for n = 1..1000</a> %Y A189557 Cf. A003415, A189481. %K A189557 nonn %O A189557 1,1 %A A189557 _T. D. Noe_, Apr 24 2011