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 A050716 #17 Aug 14 2024 16:54:24 %S A050716 13,17,23,29,37,41,43,47,53,59,61,71,79,83,97,101,103,107,109,127,131, %T A050716 133,139,151,157,161,173,193,211,221,223,227,251,269,281,283,301,307, %U A050716 311,323,329,347,349,353,371,377,401,421,457,463,479,481,487,517,523 %N A050716 Inserting a digit '6' between all adjacent digits of k makes a prime. %H A050716 Harvey P. Dale, <a href="/A050716/b050716.txt">Table of n, a(n) for n = 1..1001</a> %e A050716 481 becomes 4(6)8(6)1 becomes prime 46861. %t A050716 Select[Range[10,600],PrimeQ[FromDigits[Riffle[IntegerDigits[#],6]]]&] (* _Harvey P. Dale_, Aug 26 2013 *) %Y A050716 Cf. A050674, A050711-A050719. %K A050716 nonn,base %O A050716 1,1 %A A050716 _Patrick De Geest_, Aug 15 1999 %E A050716 Definition clarified by _Harvey P. Dale_, Aug 26 2013 %E A050716 Offset changed by _Andrew Howroyd_, Aug 14 2024