The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A091887

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A091887

Irregularity index of the n-th irregular prime A000928(n).
(history; published version)

#11 by Alois P. Heinz at Thu Nov 27 15:29:58 EST 2014

STATUS

proposed

approved

#10 by Michel Marcus at Thu Nov 27 15:07:43 EST 2014

STATUS

editing

proposed

#9 by Michel Marcus at Thu Nov 27 15:07:36 EST 2014

REFERENCES

J. Buhler, R. Crandall, R. Ernvall, T. Metsankyla and M. A. Shokrollahi, Irregular Primes and Cyclotomic Invariants to 12 Million, J. Symbolic Computation 31, 2001, 89-96.

LINKS

J. Buhler, R. Crandall, R. Ernvall, T. Metsankyla and M. A. Shokrollahi, <a href="http://dx.doi.org/10.1006/jsco.1999.1011">Irregular Primes and Cyclotomic Invariants to 12 Million</a>, J. Symbolic Computation 31, 2001, 89-96.

STATUS

proposed

editing

#8 by Jon E. Schoenfield at Thu Nov 27 14:53:16 EST 2014

STATUS

editing

proposed

#7 by Jon E. Schoenfield at Thu Nov 27 14:53:13 EST 2014

LINKS

T. D. Noe, <a href="/A091887/b091887.txt">Table of n, a(n) for n=1..10000</a> (from Buhler et al.)

STATUS

approved

editing

#6 by Russ Cox at Fri Mar 30 17:22:32 EDT 2012

AUTHOR

_T. D. Noe (noe(AT)sspectra.com), _, Feb 09 2004

Discussion

Fri Mar 30

17:22

OEIS Server: https://oeis.org/edit/global/120

#5 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

T. D. Noe, <a href="/A091887/b091887.txt">Table of n, a(n) for n=1..10000</a> (from Buhler et al)

KEYWORD

nonn,new

nonn

#4 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

LINKS

T. D. Noe, <a href="http://www.research.att.com/~njas/sequences/b091887.txt">Table of n, a(n) for n=1..10000</a> (from Buhler et al)

KEYWORD

nonn,new

nonn

#3 by N. J. A. Sloane at Fri Sep 29 03:00:00 EDT 2006

REFERENCES

J. Buhler, R. Crandall, R. Ernvall, T. Metsankyla and M. A. Shokrollahi, Irregular Primes and Cyclotomic Invariants to 12 Million, J. Symbolic Computation 31, 2001, 89-96.

LINKS

T. D. Noe, <a href="http://www.research.att.com/~njas/sequences/b091887.txt">Table of n, a(n) for n=1..10000</a> (from Buhler et al)

KEYWORD

nonn,new

nonn

#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

MATHEMATICA

tp=Table[p=Prime[i]; cnt=0; k=1; While[2k<=p-3, If[Mod[Numerator[BernoulliB[2k]], p]==0, cnt++ ]; k++ ]; cnt, {i, 400}]; Select[tp, #>0&]

KEYWORD

nonn,new

nonn