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 A386966 #12 Sep 01 2025 03:11:59
%S A386966 545,1407,1492,2409,3370,3605,3718,4516,4523,4684,5441,6348,7346,7737,
%T A386966 7865,7922,8122,8538,9046,10010,10037,10298,10458,10554,10651,10891,
%U A386966 10953,11047,11653,11853,11986,12025,12449,13621,14078,14098,14535,14970,16138,16449,16705,16905,17401,18149,18161,18509
%N A386966 Numbers that can be written in exactly two different ways as s_1^x_1 + ... + s_t^x_t, with 1 < s_1 < ... < s_t and {s_1,..., s_t} = {x_1,..., x_t} for some t > 0.
%e A386966 545 = 2^6 + 3^2 + 4^4 + 6^3 = 2^7 + 3^5 + 5^3 + 7^2.
%e A386966 1407 = 2^10 + 3^3 + 4^4 + 10^2 = 2^7 + 3^4 + 4^5 + 5^3 + 7^2.
%e A386966 1492 = 2^10 + 3^5 + 5^3 + 10^2 = 2^7 + 3^6 + 4^4 + 6^2 + 7^3.
%Y A386966 Subsequence of A385969.
%Y A386966 Cf. A385232, A385233, A385970, A386967, A386968.
%K A386966 nonn,changed
%O A386966 1,1
%A A386966 _Alberto Zanoni_, Aug 12 2025