A135116 Integers k such that 10^k + 61 is a prime number.

1, 3, 4, 10, 12, 16, 33, 696, 739, 1764, 2577, 3198, 4242, 11104, 18081, 19587, 20799, 22986, 92178

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, Jul 14 2010

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10061".

Examples

			4 is a term because 10^4 + 61 = 10000 + 61 = 10061, 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 11104 from Robert Price, Mar 22 2010

Terms 1764, 2577, 3198, 4242, 18081, 19587, 20799, 22986 from Robert Price, Jul 14 2010

Edited by Ray Chandler, Dec 23 2010

a(19)=92178 from Robert Price, Apr 19 2011