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 A386901 #25 Aug 23 2025 16:08:14 %S A386901 80850,158340,161070,161700,232050,242550,316680,322140,323400,404250, %T A386901 464100,474810,475020,483210,485100,485940,565950,633360,641550, %U A386901 644280,646800,662340,696150,727650,791700,805350,808500,963270,966420,967890,970200,971880 %N A386901 Integers y such that there exist two integers 0<x<=y<=z such that psi(x) = psi(y) = psi(z) = x + y + z. %C A386901 The numbers x, y and z form a psi-amicable triple. %H A386901 S. I. Dimitrov, <a href="https://arxiv.org/abs/2508.02318">On psi-amicable numbers and their generalizations</a>, arXiv:2508.02318 [math.NT], 2025. %e A386901 158340 is in the sequence since psi(150150) = psi(158340) = psi(175350) = 483840 = 150150 + 158340 + 175350. Other examples: (232050, 232050, 261660), (7091700, 7098630, 7098630). %Y A386901 Cf. A001615, A125491, A323329, A385852, A386933. %K A386901 nonn,new %O A386901 1,1 %A A386901 _S. I. Dimitrov_, Aug 07 2025