

A135131


Integers n such that 10^n + 79 is a prime number.


1



1, 2, 4, 7, 16, 18, 43, 60, 73, 91, 106, 115, 120, 169, 394, 444, 516, 835, 886, 1912, 3120, 3602, 5664, 10188, 14434, 16564, 23732, 29058, 47728, 63916
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OFFSET

1,2


COMMENTS

If any additional terms exist, they are >40000.  Robert Price, Sep 25 2010
See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "10079".


LINKS

Table of n, a(n) for n=1..30.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

7 is a member because 10^7+79 = 10000000+79 = 10000079, which is a prime number.


MATHEMATICA

Select[Range[1000], PrimeQ[10^# + 79] &] (* G. C. Greubel, Sep 28 2016 *)


CROSSREFS

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.
Sequence in context: A247291 A030033 A280031 * A032363 A239390 A026731
Adjacent sequences: A135128 A135129 A135130 * A135132 A135133 A135134


KEYWORD

more,nonn


AUTHOR

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


EXTENSIONS

Added two terms: 10188 and 14434. Robert Price, Mar 22 2010
Added seven terms: 1912, 3120, 3602, 5664, 16564, 23732, 29058. Robert Price, Sep 25 2010
Edited by Ray Chandler, Dec 23 2010
a(29)=47728 from Robert Price, Dec 31 2010
a(30)=63916 from Robert Price, Jan 29 2011


STATUS

approved



