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 A244607 #17 Oct 06 2019 17:21:03 %S A244607 3,4,6,8,13,14,16,18,22,23,24,26,27,29,31,32,34,36,38,41,42,43,45,46, %T A244607 48,54,56,61,62,63,64,65,67,68,69,72,76,81,83,84,86,89,92,96,98,113, %U A244607 114,116,118,122,123,124,126,127,129,131,132,134,136,138,141,142,143,145,146 %N A244607 Numbers k such that (product of digits of k) - 1 is prime. %C A244607 This sequence is infinite. With any number a(n), you can add infinitely many 1's to its decimal representation. E.g., 32 is in this sequence, so 321, 312, 3211, 32111, 31121, 11321, etc. are also terms of this sequence. %C A244607 A number k is a term of this sequence iff A007954(k) is in A008864. %H A244607 Jens Kruse Andersen, <a href="/A244607/b244607.txt">Table of n, a(n) for n = 1..10000</a> %e A244607 3*2 - 1 = 5 is prime. Thus 32 is a term of this sequence. %o A244607 (PARI) for(n=1,10^3,d=digits(n);p=prod(i=1,#d,d[i]);if(isprime(p-1),print1(n,", "))) %Y A244607 Cf. A007954, A008864, A089377, A081988. %K A244607 nonn,base,easy %O A244607 1,1 %A A244607 _Derek Orr_, Jul 01 2014 %E A244607 Wrong term removed by _Jens Kruse Andersen_, Jul 13 2014