A219335 Irregular primes with irregularity index seven.

3238481, 5216111, 5620861, 9208289, 32012327, 192539449, 197456669, 241759951, 294014299, 315034487, 329438539, 347672873, 348049913, 351984683, 412348919, 465404153, 480509321, 497070473, 530088179, 573652109, 595050143, 625827959, 641663437, 690262997, 702149209

Offset

1,1

Comments

a(1)-a(4) were reported in Buhler, Crandall, Ernvall, Metsänkylä, Shokrollahi, 2001. a(5) was reported in Buhler, Harvey, 2011. - Felix Fröhlich, Jan 07 2017

Hart et al. found the first 86 terms. - Amiram Eldar, Mar 05 2019

Links

Amiram Eldar, Table of n, a(n) for n = 1..86

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.

Joe P. Buhler and David Harvey, Irregular primes to 163 million, Math. Comp., Vol. 80, No. 276 (2011), 2435-2444.

William Hart, David Harvey and Wilson Ong, Irregular primes to two billion, Mathematics of Computation, Vol. 86, No. 308 (2017), pp. 3031-3049; also available at arXiv:1605.02398 [math.NT], 2016.

David Harvey, Irregular primes to two billion (includes a list of all primes less than 2^31).

Crossrefs

Cf. A061576, A007703, A000928, A073276, A073277, A060975, A219332, A219333, A219334.

Sequence in context: A209715 A361613 A235211 * A203731 A138360 A206083

Adjacent sequences: A219332 A219333 A219334 * A219336 A219337 A219338

Keyword

hard,nonn

Author

Robert G. Wilson v, Nov 18 2012

Extensions

a(6)-a(25) from Amiram Eldar, Mar 05 2019

Status

approved