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 A285847 #33 Dec 09 2017 19:25:14 %S A285847 6,8,9,10,12,14,15,18,20,21,24,26,28,30,33,35,36,38,39,40,42,44,45,48, %T A285847 50,51,54,56,58,60,62,63,65,66,68,69,70,72,75,76,77,78,80,84,86,87,90, %U A285847 91,93,95,96,98,99,100,102,104,105,108,110,111 %N A285847 N-positions in the sum-from-product game. %C A285847 The sum-from-product game is played by two players alternating moves. Given a positive integer n, a player can choose any two integers a and b, such that ab=n. The player subtracts a+b from n, given that the result is positive. That is, the next player starts with a new number n-a-b. A player without a move loses. %C A285847 Prime numbers are P-positions. %C A285847 P-positions are A285304. %H A285847 Pratik Alladi, Neel Bhalla, Tanya Khovanova, Nathan Sheffield, Eddie Song, William Sun, Andrew The, Alan Wang, Naor Wiesel, Kevin Zhang Kevin Zhao, <a href="https://arxiv.org/abs/1707.07201">PRIMES STEP Plays Games</a>, arXiv:1707.07201 [math.CO], 2017, Section 6. %e A285847 Numbers 1, 2, 3, 4, 5, 7, 11 are P-positions as there are no legal moves. Therefore, 6 and 8 are N-positions, as the only move from 6 goes to 1, and the only move from 8 goes to 2. It follows that 16 is a P-position as there are two moves: 16-4-4 = 8, and 16-2-8 = 6: both are N-positions. %Y A285847 Cf. A285304. %K A285847 nonn %O A285847 1,1 %A A285847 _Tanya Khovanova_ and students, May 06 2017