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

Terms

a(0) =10a(1) =1111a(2) =10a(3) =111111a(4) =11a(5) =1110a(6) =11111110a(7) =1111a(8) =11a(9) =111111a(10) =1111111110a(11) =111111a(12) =11a(13) =1111a(14) =11111111a(15) =111111111110a(16) =11111111a(17) =1111a(18) =11a(19) =111111a(20) =1111111111a(22) =1111111111a(23) =111111a(24) =11a(25) =1111a(26) =11111111a(27) =111111111111