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A135117 Integers n such that 10^n+87 is a prime number. 1
1, 3, 9, 19, 39, 43, 121, 153, 1243, 14445, 15273, 26779 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The next term, if one exists, is >100000. [From Robert Price, Apr 25 2011]

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10087".

LINKS

Table of n, a(n) for n=1..12.

Makoto Kamada, List of near-repdigit-related prime numbers.

Index entries for primes involving repunits.

EXAMPLE

3 is a member because 10^3+87 = 1000+87 = 1087, which is a prime number.

CROSSREFS

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

Sequence in context: A115238 A005994 A080010 * A038163 A146819 A147213

Adjacent sequences:  A135114 A135115 A135116 * A135118 A135119 A135120

KEYWORD

more,nonn

AUTHOR

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

EXTENSIONS

Added term 14445. Robert Price, Mar 22 2010

Added terms: 1243,15273,26779 Robert Price, Oct 04 2010

Edited by Ray Chandler, Dec 23 2010

STATUS

approved

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