The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A062834 Denominator of sum of first n terms of the series 1/3 + 1/8 + 1/24 ... in which the denominators are one less than a perfect square that cannot otherwise be written as a power (cf. A062757, A037450). 3
 3, 24, 2, 70, 1680, 55440, 55440, 65520, 65520, 5040, 10080, 5040, 1627920, 1627920, 85680, 942480, 21677040, 492660, 107100, 64260, 621180, 1242360, 1328040, 10624320, 1328040, 14608440, 1217370, 277560360, 133506533160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES W. Dunham, Euler: The Master of Us All, The Mathematical Association of America, Washington D.C., 1999, p. 66. L. Euler, "Variae observationes circa series infinitas," Opera Omnia, Ser. 1, Vol. 14, pp. 216-244. LINKS Table of n, a(n) for n=1..29. L. Euler, Variae observationes circa series infinitas MATHEMATICA Table[ Denominator[ Plus@@(Take[ Select[ Range[ 2, 50 ], GCD@@(Last/@FactorInteger[ # ])==1& ]^2-1, k ]^-1) ], {k, 1, 29} ] CROSSREFS Cf. A062757, A037450. Sequence in context: A264929 A204578 A120085 * A047980 A084702 A367190 Adjacent sequences: A062831 A062832 A062833 * A062835 A062836 A062837 KEYWORD nonn AUTHOR Jason Earls, Jul 21 2001 EXTENSIONS More terms from Dean Hickerson, Jul 24, 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 28 04:02 EDT 2024. Contains 372900 sequences. (Running on oeis4.)