OFFSET
1,1
COMMENTS
11 is equal to 2 protons. 1111 is equal 2+2 protons. 111111 is equal 2+2+2 protons...
Repunit numbers represent the subshells.
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Aug 10 2007, Aug 12 2007
STATUS
approved