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A030433 Primes of form 10n+9. 24
19, 29, 59, 79, 89, 109, 139, 149, 179, 199, 229, 239, 269, 349, 359, 379, 389, 409, 419, 439, 449, 479, 499, 509, 569, 599, 619, 659, 709, 719, 739, 769, 809, 829, 839, 859, 919, 929, 1009, 1019, 1039, 1049, 1069, 1109, 1129, 1229, 1249, 1259, 1279, 1289 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also primes of form 5n+4.

5 is quadratic residue of primes of form 10*n-1. - Vincenzo Librandi, Jun 25 2014

LINKS

Michael B. Porter, Table of n, a(n) for n = 0..100000

A. Granville and G. Martin, Prime number races

Erika Klarreich, Mathematicians Discover Prime Conspiracy, Quanta Magazine, 2016.

R. J. Lemke Oliver and K. Soundararajan, Unexpected biases in the distribution of consecutive primes, arXiv:1603.03720, 2016.

FORMULA

a(n) = 10*A102700(n) + 9.

Union of A132234 and A132236. - Ray Chandler, Apr 07 2009

MATHEMATICA

Select[Prime@Range[210], Mod[ #, 10] == 9 &] (* Ray Chandler, Nov 07 2006 *)

Select[Range[9, 1300, 10], PrimeQ] (* Harvey P. Dale, Jun 01 2012 *)

PROG

(PARI) select(n->n%10==9, primes(100)) \\ Charles R Greathouse IV, Apr 29 2015

CROSSREFS

Cf. A045457, A049510, A102700.

Sequence in context: A084666 A242265 A004618 * A242550 A141311 A090148

Adjacent sequences:  A030430 A030431 A030432 * A030434 A030435 A030436

KEYWORD

nonn,changed

AUTHOR

Warut Roonguthai

EXTENSIONS

Extended by Ray Chandler, Nov 07 2006

STATUS

approved

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Last modified May 31 00:01 EDT 2016. Contains 273533 sequences.