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 A385348 #4 Jun 26 2025 07:42:26 %S A385348 1,3,2,4,4,6,6,4,7,16,18,7,7,14,15,15,21,9,11,19,18,24,33,11,26,13,14, %T A385348 47,48,17,14,19,14,54,43,14,22,34,40,33,17,39,14,17,36,54,67,38,21,26, %U A385348 18,135,40,19,25,25,24,79,78,20,25,25,24,101,30,25,24,24,34,24 %N A385348 Minimum number of products of the form P^2-i^2 to be used to obtain the GCD defined in A380472. %o A385348 (PARI) f(n) = (2*n+2)!*(3/4-(-1)^n/4); \\ A380472 %o A385348 T(n, j) = gcd(vector(j, k, P=prime(k+n+1); prod(i=1, n, P^2-i^2))); %o A385348 a(n) = my(x=f(n)); for (j=1, n^2, if (T(n, j) == x, return(j))); %Y A385348 Cf. A380472. %K A385348 nonn %O A385348 1,2 %A A385348 _Michel Marcus_, Jun 26 2025