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 A183528 #12 May 02 2017 15:32:29 %S A183528 1,2,3,4,5,15,25,26,27,28,29,35,43,45,165,171,172,174,180,181,328,333, %T A183528 338,339,340,341,493,499,500,647,652,657,658,659,660,661,662,663,815, %U A183528 818,819,971,1127,1137,1138,1139,1140,1141,1142 %N A183528 An Ulam-type sequence: a(n) = n if n<=5; for n>5, a(n) = least number > a(n-1) which is a unique sum of 5 distinct earlier terms. %C A183528 An Ulam-type sequence - see A002858 for further information. %H A183528 Alois P. Heinz, <a href="/A183528/b183528.txt">Table of n, a(n) for n = 1..1000</a> %H A183528 <a href="/index/U#Ulam_num">Index entries for Ulam numbers</a> %e A183528 a(6) = 15 = 1 + 2 + 3 + 4 + 5 = 5*6/2, because it is the least number >5 with a unique sum of 5 distinct earlier terms. %e A183528 a(7) = 25 = 1 + 2 + 3 + 4 + 15 = 5^2, because it is the least number >15 with a unique sum of 5 distinct earlier terms. %p A183528 # see A183534 for programs. %Y A183528 Column k=5 of A183534. %Y A183528 Cf. A002858, A007086, A183527-A183533, A135737. %K A183528 nonn %O A183528 1,2 %A A183528 _Jonathan Vos Post_ and _Alois P. Heinz_, Jan 05 2011