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 A215408 #12 Feb 16 2025 08:33:18 %S A215408 2,6,4,42,10,118,250,140,4206,3786,41933,1798,722,87066,8691,5978 %N A215408 Smallest number whose home prime (cf. A037274) is the home prime of exactly n natural numbers. %C A215408 The home primes of the sequence are A118756. %D A215408 J. Heleen, Family Numbers: Constructing Primes By Prime Factor Splicing, J. Rec. Math. 28 (1996-97), 116-119. %H A215408 P. de Geest, <a href="http://www.worldofnumbers.com/topic1.htm">Home Primes < 100 and Beyond</a> %H A215408 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HomePrime.html">Home Prime.</a> %H A215408 Wikipedia, <a href="http://en.wikipedia.org/wiki/Home_prime">Home prime</a> %F A215408 A037274(a(n)) = A118756(n). %e A215408 The home prime of the four numbers 42, 74, 237, and 379 is 379 (for example, 42 = 2*3*7 -> 237 = 3*79 -> 379 which is prime), so a(4) = 42. %Y A215408 Cf. A037274, A118756, and their cross-references. %K A215408 nonn,base %O A215408 1,1 %A A215408 _Jonathan Sondow_, Aug 09 2012