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 A334803 #20 Jul 19 2021 23:00:02 %S A334803 24,36,3276,1886976 %N A334803 Numbers k such that k*p is divisible by k+p and k-p, where k > p > 0 and p = A007954(k) = the product of digits of k. %C A334803 If a(5) exists it is at least 3*10^12. %C A334803 a(5) > 1.5*10^14, if it exists. - _Giovanni Resta_, May 12 2020 %e A334803 24 is a term as p = 2*4 = 8 and 24*8 = 192 is divisible by both 24-8 = 16 and 24+8 = 32. %e A334803 36 is a term as p = 3*6 = 18 and 38*18 = 648 is divisible by both 36-18 = 18 and 36+18 = 54. %e A334803 3276 is a term as p = 3*2*7*6 = 252 and 3276*252 = 825552 is divisible by both 3276-252 = 3024 and 3276+252 = 3528. %e A334803 1886976 is a term as p = 1*8*8*6*9*7*6 = 145152 and 1886976*145152 = 273898340352 is divisible by both 1886976-145152 = 1741824 and 1886976+145152 = 2032128. %o A334803 (PARI) isok(m) = my(p=vecprod(digits(m))); p && (m-p) && !((m*p) % (m-p)) && !((m*p) % (m+p)); \\ _Michel Marcus_, May 12 2020 %Y A334803 Cf. A007954, A049102, A085124. %Y A334803 Subsequence of A052382. Intersection of A334679 and A330880. %K A334803 nonn,base,more %O A334803 1,1 %A A334803 _Scott R. Shannon_, May 12 2020