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Numbers from the "octagonal theorem of sixty".
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%I #14 May 14 2018 11:12:02

%S 1,2,3,4,6,7,9,12,13,14,18,60

%N Numbers from the "octagonal theorem of sixty".

%H Jangwon Ju, <a href="https://arxiv.org/abs/1805.03434">Universal sums of generalized pentagonal numbers</a>, arXiv:1805.03434 [math.NT], 2018 (see page 2).

%H Jangwon Ju and Byeong-Kweon Oh, <a href="https://arxiv.org/abs/1704.08826">Universal sums of generalized pentagonal numbers</a>, arXiv:1704.08826 [math.NT], 2017 (see page 6, Theorem 3.1).

%Y Cf. A030050, A030051, A116582, A154363, A304204.

%K nonn,fini,full

%O 1,2

%A _Vincenzo Librandi_, May 11 2018