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 A244748 #41 Oct 06 2019 17:23:43 %S A244748 1,2,4,6,11,12,14,16,21,22,23,25,27,28,32,38,41,44,45,46,49,52,54,58, %T A244748 61,64,66,69,72,78,82,83,85,87,94,96,111,112,114,116,121,122,123,125, %U A244748 127,128,132,138,141,144,145,146,149,152,154,158,161,164,166,169,172,178,182,183 %N A244748 Numbers k such that (product of digits of k)^2 + 1 is prime. %C A244748 A number k is a term of this sequence iff A007954(k)^2 is in A006093. %C A244748 This sequence is infinite. With any number a(n), you can add infinitely many 1's to its decimal representation. E.g., 85 is in this sequence, so 185, 815, 851, 1185, 1815, 18115, etc. are terms as well. %H A244748 Jens Kruse Andersen, <a href="/A244748/b244748.txt">Table of n, a(n) for n = 1..10000</a> %e A244748 (7*2)^2 + 1 = 197 is prime. Thus 72 is a term of this sequence. %o A244748 (PARI) for(n=1,10^3,d=digits(n);if(ispseudoprime(prod(i=1,#d,d[i])^2+1),print1(n,", "))) %Y A244748 Cf. A081988, A007954. %K A244748 nonn,base,easy %O A244748 1,2 %A A244748 _Derek Orr_, Jul 12 2014 %E A244748 Corrected by _Jens Kruse Andersen_, Jul 13 2014