cp's OEIS Frontend

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.

A130598 A shell geometric model of the nucleus. The location of the magic numbers. A triangle.

Original entry on oeis.org

10, 1111, 10, 111111, 11, 1110, 11111110, 1111, 11, 111111, 1111111110, 111111, 11, 1111, 11111111, 111111111110, 11111111, 1111, 11, 111111, 1111111111, 11111111111110, 1111111111, 111111, 11, 1111, 11111111, 111111111111
Offset: 1

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Author

Omar E. Pol, Aug 10 2007

Keywords

Comments

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.

Examples

			......|----------------------- h -------------------|.....
......|.....|----------------- g --------------|....|.....
......|.....|.....|----------- f ---------|....|....|.....
......|.....|.....|....|------ d -----|...|....|....|.....
......|.....|.....|....|...|-- p -|...|...|....|....|.....
......|.....|.....|....|...|.. s .|...|...|....|....|.....
......|.....|.....|....|...|......|...|...|....|....|.....
......|.....|.....|....|......10......|...|....|....|.....
......|.....|.....|......1111....10.......|....|....|.....
......|.....|.......111111....11....1110.......|....|.....
......|........11111110..1111....11....111111.......|.....
.......1111111110...111111....11....1111...11111111.|.....
111111111110...11111111..1111....11....111111...1111111111
......|.....|.....|....|...|..|...|...|...|....|....|.....
......|.....|.....|....|...|..|1/2|...|...|....|....|.....
......|.....|.....|....|...|-- 3/2 ---|...|....|....|.....
......|.....|.....|....|------ 5/2 -------|....|....|.....
......|.....|.....|----------- 7/2 ------------|....|.....
......|.....|----------------- 9/2 -----------------|.....
......|---------------------- 11/2 -----------------------
		

Crossrefs