# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a374193 Showing 1-1 of 1 %I A374193 #14 Jul 01 2024 13:11:49 %S A374193 2,1471,269406 %N A374193 a(n) is the smallest number which can be represented as the sum of two nonzero pentagonal pyramidal numbers in exactly n ways, or -1 if no such number exists. %C A374193 There are no further positive terms <= 10^15. - _Michael S. Branicky_, Jul 01 2024 %H A374193 Eric Weisstein's World of Mathematics, Pentagonal Pyramidal Number %e A374193 a(2) = 1471 = 1 + 1470 = 288 + 1183. %Y A374193 Cf. A002411, A011541, A332989, A334013, A374168, A374194. %K A374193 nonn,hard,more,bref %O A374193 1,1 %A A374193 _Ilya Gutkovskiy_, Jun 30 2024 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE