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 A130598 #7 Mar 31 2012 20:55:21 %S A130598 10,1111,10,111111,11,1110,11111110,1111,11,111111,1111111110,111111, %T A130598 11,1111,11111111,111111111110,11111111,1111,11,111111,1111111111, %U A130598 11111111111110,1111111111,111111,11,1111,11111111,111111111111 %N A130598 A shell geometric model of the nucleus. The location of the magic numbers. A triangle. %C A130598 The magic numbers of the atomic nucleus: 2, 8, 20, 28, 50, 82, 126. 0 is the location of a magic number. 10 or 11 is equal to 2 protons (or neutrons). 1110 or 1111 is equal to 2+2 protons (or neutrons). 111111 is equal to 2+2+2 protons (or neutrons)... The 2D model is a triangle and a spiral. The 3D model is a double tetrahedron and a double spiral. %e A130598 ......|----------------------- h -------------------|..... %e A130598 ......|.....|----------------- g --------------|....|..... %e A130598 ......|.....|.....|----------- f ---------|....|....|..... %e A130598 ......|.....|.....|....|------ d -----|...|....|....|..... %e A130598 ......|.....|.....|....|...|-- p -|...|...|....|....|..... %e A130598 ......|.....|.....|....|...|.. s .|...|...|....|....|..... %e A130598 ......|.....|.....|....|...|......|...|...|....|....|..... %e A130598 ......|.....|.....|....|......10......|...|....|....|..... %e A130598 ......|.....|.....|......1111....10.......|....|....|..... %e A130598 ......|.....|.......111111....11....1110.......|....|..... %e A130598 ......|........11111110..1111....11....111111.......|..... %e A130598 .......1111111110...111111....11....1111...11111111.|..... %e A130598 111111111110...11111111..1111....11....111111...1111111111 %e A130598 ......|.....|.....|....|...|..|...|...|...|....|....|..... %e A130598 ......|.....|.....|....|...|..|1/2|...|...|....|....|..... %e A130598 ......|.....|.....|....|...|-- 3/2 ---|...|....|....|..... %e A130598 ......|.....|.....|....|------ 5/2 -------|....|....|..... %e A130598 ......|.....|.....|----------- 7/2 ------------|....|..... %e A130598 ......|.....|----------------- 9/2 -----------------|..... %e A130598 ......|---------------------- 11/2 ----------------------- %Y A130598 Cf. A056951, A130517, A130556, A130602. %K A130598 nonn,tabl %O A130598 1,1 %A A130598 _Omar E. Pol_, Aug 10 2007