OFFSET
5,2
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 5..10000
A. H. Pfund, The emission of nitrogen and hydrogen in the infrared, Journal of the Optical Society of America, Vol. 9, Issue 3, (1924) pp. 193-196.
MATHEMATICA
Table[Denominator[1/5^2 - 1/n^2], {n, 7, 50}] (* G. C. Greubel, Jul 07 2017 *)
PROG
(PARI) a(n) = denominator(1/25 - 1/n^2); \\ Michel Marcus, Aug 15 2013
(Haskell)
import Data.Ratio ((%), denominator)
a061044 = denominator . (1 % 25 -) . recip . (^ 2) . fromIntegral
-- Reinhard Zumkeller, Jan 06 2014
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, May 26 2001
STATUS
approved