A135117 Integers k such that 10^k + 87 is a prime number.

1, 3, 9, 19, 39, 43, 121, 153, 1243, 14445, 15273, 26779

Offset: 1

Author

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

Keywords

• nonn
• more

Comments

The next term, if one exists, is > 100000. - 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".

Examples

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

Links

• Makoto Kamada, List of near-repdigit-related prime numbers.
• Index entries for primes involving repunits.

Crossrefs

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

Extensions

Term 14445 from Robert Price, Mar 22 2010

Terms 1243, 15273, 26779 from Robert Price, Oct 04 2010

Edited by Ray Chandler, Dec 23 2010