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 A379950 #14 Mar 12 2025 04:44:30 %S A379950 585,32085,41925,46665,121605,134589,181305,212175,388455,495465, %T A379950 544065,839865,1061565,1152921,1165515,1243275,1247103,1335411, %U A379950 1676829,2151075,2290869,2478075,2771835,2838165,3016725,3122847,3156795,4571415,4738041,5153841,5558985,6125049,7471425,7676775,7780101,7822425,8259867 %N A379950 Numbers k such that k^2 is an odd primitive abundant number (A006038). %H A379950 Amiram Eldar, <a href="/A379950/b379950.txt">Table of n, a(n) for n = 1..3500</a> (terms 1..725 from Antti Karttunen) %F A379950 a(n) = A000196(A379949(n)). %o A379950 (PARI) isok(k) = if(!(k % 2), 0, my(f = factor(k)); for(i = 1, #f~, f[i, 2] *= 2); if(sigma(f, -1) <= 2, return(0)); for(i = 1, #f~, f[i, 2] -= 1; if(sigma(f, -1) > 2, return(0)); f[i, 2] += 1); 1); \\ _Amiram Eldar_, Mar 12 2025 %Y A379950 Square roots of A379949. %Y A379950 Subsequence of A174830. %Y A379950 Cf. A000196, A006038. %K A379950 nonn %O A379950 1,1 %A A379950 _Antti Karttunen_, Jan 07 2025