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 A246043 #18 May 07 2025 12:35:45 %S A246043 13,17,31,37,71,73,79,97,107,118,119,124,125,127,128,133,139,142,146, %T A246043 152,164,169,170,172,181,182,191,193,196,214,215,217,218,238,239,241, %U A246043 251,271,277,281,283,293,313,319,328,329,331,346,347,349,356,364,365,367,368,374,376,382,386,391,392,394,412,416,421,436,437 %N A246043 Biprimatic permutable numbers: Decimal numbers whose digits can be arranged to form exactly two prime numbers. No leading zeros. %C A246043 In base ten these numbers can be said to have a prime twin made up of the same digits. %H A246043 Andreas Boe, <a href="/A246043/b246043.txt">Table of n, a(n) for n = 1..14440</a> %e A246043 170 -> 017 (forbidden), 071 (forbidden), 107 (prime), 170 (even), 701 (prime), 710 (even) -> conclusion: Two prime numbers. %t A246043 Select[Range[500],Count[FromDigits/@Select[Permutations[IntegerDigits[#]], #[[1]] != 0&],_?PrimeQ]==2&] (* _Harvey P. Dale_, Oct 23 2018 *) %Y A246043 A245808: Monoprimatic permutable numbers %Y A246043 A246044: Monoprimatic permutable primes %Y A246043 A246045: Biprimatic permutable primes %K A246043 nonn,base %O A246043 1,1 %A A246043 _Andreas Boe_, Aug 23 2014