OFFSET
0,2
LINKS
N. J. A. Sloane, Table of n, a(n) for n = 0..9999
FORMULA
G.f. = (Sum_{p in A006995} x^p)^2.
EXAMPLE
8=1+7=3+5=5+3=7+1, so a(8)=4.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Sep 04 2015
STATUS
approved