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 A386933 #16 Aug 23 2025 16:08:18 %S A386933 81900,161700,163800,175350,245700,261660,323400,327600,350700,409500, %T A386933 485100,490770,491400,499380,523320,526050,526260,573300,646800, %U A386933 647010,655200,671370,701400,702450,737100,784980,808500,819000,876750,970200,971880,981540,982800,990150,998760 %N A386933 Integers z such that there exist two integers 0<x<=y<=z such that psi(x) = psi(y) = psi(z) = x + y + z. %C A386933 The numbers x, y and z form a psi-amicable triple. %H A386933 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 A386933 163800 is in the sequence since psi(158340) = psi(161700) = psi(163800) = 564480 = 158340 + 161700 + 163800. Other examples: (322140, 322140, 323400), (14127960, 14224980, 14224980). %Y A386933 Cf. A001615, A125492, A323330, A385852, A386901. %K A386933 nonn,new %O A386933 1,1 %A A386933 _S. I. Dimitrov_, Aug 09 2025