

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
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..17.
Makoto Kamada, List of nearrepdigitrelated 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,changed


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



