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 A333011 #15 Mar 06 2020 08:10:51 %S A333011 6,13,17,23,27,34,36,40,47,52,56,57,63,71,73,75,82,86,92,93,97,104, %T A333011 105,114,118,121,122,127,129,139,143,146,150,152,157,162,167,168,177, %U A333011 180,181,187,188,196,198,209,222,227,232,237,245,246,248,252,259,261,262 %N A333011 Integers which can be written in only one way as a sum of two distinct nonzero pentagonal numbers. %C A333011 The first term of A332988 not in this sequence is 211. %H A333011 Jinyuan Wang, <a href="/A333011/b333011.txt">Table of n, a(n) for n = 1..10000</a> %o A333011 (PARI) is(k) = sum(i=1, sqrt(1+12*k)\6, sqrt(1+24*k+12*i-36*i*i)%6==5) == 1; \\ _Jinyuan Wang_, Mar 06 2020 %Y A333011 Cf. A000326, A332988, A333011, A333012, A333013, A333014, A333015. %K A333011 nonn %O A333011 1,1 %A A333011 _Olivier Gérard_, Mar 05 2020