The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A061044 Denominator of 1/25 - 1/n^2. 6
 1, 900, 1225, 1600, 2025, 100, 3025, 3600, 4225, 4900, 225, 6400, 7225, 8100, 9025, 80, 11025, 12100, 13225, 14400, 625, 16900, 18225, 19600, 21025, 180, 24025, 25600, 27225, 28900, 1225, 32400, 34225, 36100, 38025, 1600, 42025 (list; graph; refs; listen; history; text; internal format)
 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 0ptical 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 See A061041 for comments, references, links. Cf. A061043 (numerator). Sequence in context: A210129 A158408 A158409 * A344595 A344694 A127658 Adjacent sequences:  A061041 A061042 A061043 * A061045 A061046 A061047 KEYWORD nonn,frac AUTHOR N. J. A. Sloane, May 26 2001 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 13 15:27 EDT 2021. Contains 345006 sequences. (Running on oeis4.)