login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089172 Values of n where numerators of series coefficients of 1/(1 + Cosh[Sqrt[x]]) differ from A002425. 0
11, 19, 24, 27, 29, 33, 34, 35, 39, 43, 44, 48, 49, 50, 51, 53, 54, 55, 59, 61, 62, 64, 65, 67, 69, 71, 75, 76, 79, 80, 83, 84, 87, 89, 90, 91, 94, 97, 98, 99, 101, 103, 104, 105, 107, 108, 109, 111, 113, 114, 115, 116, 118, 119, 120, 123, 124, 125, 127 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..59.

MATHEMATICA

it=Table[Numerator[2*BernoulliB[2*n]*(4^n-1)/(2*n)]/ Numerator[SeriesCoefficient[Series[1/(1+Cosh[x]), {x, 0, 2n}], 2n-2]], {n, 1, 96}]; Flatten[Position[it, q_Integer/; q>1]]-1

CROSSREFS

Cf. A002425.

Sequence in context: A280993 A105908 A084654 * A152567 A029481 A289700

Adjacent sequences:  A089169 A089170 A089171 * A089173 A089174 A089175

KEYWORD

nonn

AUTHOR

Wouter Meeussen, Dec 07 2003

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 25 23:56 EST 2022. Contains 350572 sequences. (Running on oeis4.)