OFFSET
1,2
COMMENTS
REFERENCES
C. Pickover, Mazes for the Mind, St. Martin's Press, NY, 1992, p. 350-351.
MATHEMATICA
a = {2, 71, 828, 1828, 45904, 5235360, 2874713, 52662497, 757247093, 6999595749, 66967627724, 76630353547, 5945713821785, 25166427427466, 391932003059921, 8174135966290435, 72900334295260595, 630738132328627943};
b = Table[Length[IntegerDigits[a[[n]]]], {n, 1, Length[a]}];
c = Table[Sum[b[[m]], {m, 1, n}] - 1, {n, 1, Length[b]}] Sum[a[[n]]/10^(c[[n]]), {n, 1, Length[a]}];
N[% - E, 100]
PROG
(PARI) v=[71, 828, 1828, 45904, 5235360, 2874713, 52662497, 757247093, 6999595749, 66967627724, 76630353547, 5945713821785, 25166427427466, 391932003059921, 8174135966290435, 72900334295260595, 630738132328627943];
concat([0], vector(#v, n, sum(j=1, n, #digits(v[j])))) \\ Joerg Arndt, Aug 13 2013
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Roger L. Bagula, Dec 14 2008
EXTENSIONS
Edited by Joerg Arndt and Michel Marcus, Aug 13 2013
STATUS
approved