OFFSET
1,1
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 1..500
FORMULA
a(n) = 7^(2*n-1) - floor(sqrt(7^(2*n-1)))^2.
EXAMPLE
a(1)=7^1-2^2=3, a(2)=7^3-18^2=343-324=19, a(3)=7^5-129^2=16807-16641=166.
MATHEMATICA
Table[7^(2 n - 1) - Floor[Sqrt[7^(2 n - 1)]]^2, {n, 30}] (* Wesley Ivan Hurt, Mar 06 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Nov 27 2011
STATUS
approved