OFFSET
0,2
COMMENTS
Let s(n) = A117818(n). Define sets C_n of natural numbers by C_0 = {1}; C_(n+1) = C_n union {s(x+y): x, y in C_n} for n >= 0. Then a(n) = |C_n|.
LINKS
Mihai Caragiu, P. A. Vicol, and M. Kaki, On Conway's subprime function, a covering of N and an unexpected appearance of the golden ratio, Fib. Q., 55 (2017), no. 4, 327-331.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Sep 29 2017
STATUS
approved