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!)
A092681 Least number 2k such that p^2 divides the numerator of the Bernoulli number B(2k), where p is the n-th irregular prime, A000928(n). 4
284, 914, 3292, 5768, 228, 12112, 11082, 6302, 11498, 40220, 34724, 51976, 1434, 74750, 67316, 21508, 63532, 39378, 67066, 64012, 91576, 137766, 137552, 105582, 158838, 147660, 175758, 194776, 173842, 102148, 132072, 107112, 127736, 29248 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The ordered-pair (p(n),a(n)), where p(n) is the n-th irregular prime, is called a second-order irregular pair. Some irregular primes, such as 157, have more than one pair. See A091887 for a count of the pairs for each irregular prime.
LINKS
CROSSREFS
Sequence in context: A061310 A333930 A259996 * A090789 A234970 A260087
KEYWORD
nonn
AUTHOR
T. D. Noe, Mar 03 2004
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 14 09:06 EDT 2024. Contains 371657 sequences. (Running on oeis4.)