OFFSET
1,1
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..245
Wikipedia, Parasitic number.
FORMULA
From Seiichi Manyama, Aug 22 2017: (Start)
a(7*k - 6) = 3*(10^(28*k) - 1)/29.
a(7*k - 5) = 4*(10^(28*k) - 1)/29.
a(7*k - 4) = 5*(10^(28*k) - 1)/29.
a(7*k - 3) = 6*(10^(28*k) - 1)/29.
a(7*k - 2) = 7*(10^(28*k) - 1)/29.
a(7*k - 1) = 8*(10^(28*k) - 1)/29.
a(7*k) = 9*(10^(28*k) - 1)/29. (End)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
N. J. A. Sloane, based on correspondence from William A. Hoffman III (whoff(AT)robill.com), Apr 10 2009
EXTENSIONS
More terms from Seiichi Manyama, Aug 22 2017
STATUS
approved