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 A334558 #16 Jul 17 2021 04:29:36 %S A334558 429,437,598,1938,3584,3875,5576,6864,16758,36828,43778,47775,47859, %T A334558 56637,56672,82928,91798,129584,156782,165688,165838,178857,215985, %U A334558 379488,655578,798847,1881576,2893337,3918768,4816872,5439798,5829795,7558299,9675288,11943887 %N A334558 Numbers m such that m^2 + p^2 = k^2, with p > 0, where p = A007954(m) = the product of digits of m. %H A334558 Giovanni Resta, <a href="/A334558/b334558.txt">Table of n, a(n) for n = 1..147</a> (terms < 2*10^13) %e A334558 429 is a term as p = 4*2*9 = 72 and 429^2 + 72^2 = 189225 = 435^2. %e A334558 16758 is a term as p = 1*6*7*5*8 = 1680 and 16758^2 + 1680^2 = 283652964 = 16842^2. %o A334558 (PARI) isok(m) = my(p=vecprod(digits(m))); p && issquare(m^2 + p^2); \\ _Michel Marcus_, May 06 2020 %Y A334558 Cf. A007954, A000404, A078134, A334542, A334557. %K A334558 nonn,base %O A334558 1,1 %A A334558 _Scott R. Shannon_, May 06 2020