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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 (list; graph; refs; listen; history; text; internal format)
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 near-repdigit-related 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

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