A393026 - OEIS

A393026

Numbers that can be written as s_1^x_1 + s_2^x_2 + s_3^x_3, with 0 < s_1 < s_2 < s_3 and x_1 > x_2 > x_3 > 1, with the restriction that if s_1 = 1 then x_1 is the least possible.

%I #12 Feb 01 2026 10:00:53

%S 18,25,26,33,34,42,44,45,49,53,58,59,60,64,66,68,69,73,74,75,77,79,81,

%T 82,84,90,92,95,97,98,101,105,107,108,109,114,116,117,118,121,123,124,

%U 127,128,129,131,132,133,138,140,142,143,144,145,146,149,153,154,155,156,158,159,160,161

%N Numbers that can be written as s_1^x_1 + s_2^x_2 + s_3^x_3, with 0 < s_1 < s_2 < s_3 and x_1 > x_2 > x_3 > 1, with the restriction that if s_1 = 1 then x_1 is the least possible.

%H Alberto Zanoni, <a href="https://de-numbers-3.jimdosite.com">DE-numbers</a>.

%e 18 = 1^4 + 2^3 + 3^2;

%e 25 = 1^4 + 2^3 + 4^2;

%e 26 = 1^5 + 2^4 + 3^2;

%e ...

%Y Cf. A393024, A393025, A393027, A393028, A393029, A393030, A393031, A393032, A393033, A393034.

%K nonn

%O 1,1

%A _Alberto Zanoni_, Jan 31 2026