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A135108 Integers n such that 10^n+39 is a prime number. 1
2, 3, 4, 6, 8, 12, 20, 72, 196, 676, 1528, 1923, 5244, 5379, 6308, 21222, 81778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

Makoto Kamada, List of near-repdigit-related prime numbers. (See primecount.txt for terms, primesize.txt for discovery details, including probable or proved primes - search on "10039")

Index entries for primes involving repunits.

EXAMPLE

6 is a member: 10^6+39 = 1000000+39 = 1000039, which is a prime number.

MATHEMATICA

Select[Range[2000], PrimeQ[10^# + 39] &] (* G. C. Greubel, Sep 23 2016 *)

PROG

(MAGMA) [n: n in [0..500] |IsPrime(10^n+39)]; // Vincenzo Librandi, Sep 24 2016

CROSSREFS

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Sequence in context: A018465 A127107 A007886 * A018515 A018253 A143417

Adjacent sequences:  A135105 A135106 A135107 * A135109 A135110 A135111

KEYWORD

more,nonn

AUTHOR

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

EXTENSIONS

a(11)-a(12) from Harvey P. Dale, May 25 2008

a(13)-a(16) from Robert Price, Jan 30 2010

Edited by Ray Chandler, Dec 23 2010

a(17) from Robert Price, Mar 03 2011

STATUS

approved

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Last modified September 26 05:09 EDT 2017. Contains 292502 sequences.