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 A363287 #24 Jul 13 2023 17:42:32 %S A363287 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26, %T A363287 27,28,29,30,31,32,33,34,35,36,38,39,40,41,42,43,44,45,47,49,50,51,52, %U A363287 57,59,62,63,66,67,68,73,75,80,90,95,107,134,135,136,140,145,151,152,256,2040,340473 %N A363287 Numbers which cannot be written as the sum of 4 distinct proper prime powers (A246547). %C A363287 A proper prime power is an integer which is at least the 2nd power of a prime, such as 4, 8, 9, 16, 25, 27, as in A246547. %C A363287 It is likely that all numbers above 162 can be written as the sum of 5 distinct proper prime powers. %C A363287 a(72)=340473, a(73)=3881313, a(74)=4657401 and a(75) >= 10^9, if it exists. %e A363287 The smallest integer which can be written as the sum of 4 proper prime powers is 37 = 4+8+9+16 so a(n)=n for n <= 36 and a(37) = 38. %Y A363287 Cf. A246547. %K A363287 nonn %O A363287 1,2 %A A363287 _Zhao Hui Du_, May 25 2023