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 A200090 #23 May 14 2023 06:57:07 %S A200090 15015,45045,51051,62985,72930,74613,75075,105105,106590,135135, %T A200090 145860,153153,156009,165165,187473,188955,190190,195195,213180, %U A200090 218790,222870,223839,225225,279565,291720,314925,315315,319770,335478,357357,364650,375375,380380 %N A200090 Numbers k such that the sum of the distinct prime divisors of k equals three times the largest prime divisor of k. %H A200090 Amiram Eldar, <a href="/A200090/b200090.txt">Table of n, a(n) for n = 1..10000</a> %e A200090 15015 is a term because its distinct prime divisors are 3, 5, 7, 11, 13 and their sum 3 + 5 + 7 + 11 + 13 = 39 equals 3*13. %t A200090 Select[Range[400000],Plus@@(pl=First/@FactorInteger[#])==3*pl[[-1]]&] %Y A200090 Cf. A006530 (gpf), A008472 (sopf), A200070. %K A200090 nonn %O A200090 1,1 %A A200090 _Michel Lagneau_, Nov 13 2011