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 A153874 #6 Feb 06 2022 19:00:16 %S A153874 143,323,11663 %N A153874 Numbers n = abc...k such that a^2*b^2*c^2*...k^2 - 1 = n. %e A153874 1) 143 = 1^2 * 4^2 * 3^2 - 1 = 1 * 16* 9 - 1. 2) 323 = 3^2 * 2^2 * 3^2 - 1 = 9 * 4 * 9 - 1. 3) 1663 = 1^2 * 1^2* 6^2 * 6^2 * 3^2 - 1 = 1 * 1 * 36 * 36 * 9 - 1. %t A153874 Select[Range[12000],#==Times@@(IntegerDigits[#]^2)-1&] (* _Harvey P. Dale_, Feb 06 2022 *) %o A153874 (PARI) n=1;while(n!=10^16,n+=1;j=n^2-1;k=1;while(j!=0,k=k*(j%10)^2;j=floor(j/10));if(k-1==n^2-1,print(n^2-1))) %K A153874 base,nonn,fini,full,bref %O A153874 1,1 %A A153874 _Vikram Pandya_, Jan 03 2009 %E A153874 Edited by _N. J. A. Sloane_, Jan 03 2009