A135114 Integers k such that 10^k + 69 is a prime number.

1, 3, 4, 5, 10, 11, 16, 35, 49, 69, 119, 223, 400, 775, 1003, 1523, 2225, 6793, 7018, 13600, 76801

Offset

1,2

Comments

Next term in sequence, 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 "10069".

Links

Table of n, a(n) for n=1..21.

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

Index entries for primes involving repunits.

Example

5 is a term because 10^5 + 69 = 100000 + 69 = 100069, which is prime.

Crossrefs

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

Sequence in context: A185345 A260823 A359486 * A240789 A191647 A195131

Adjacent sequences: A135111 A135112 A135113 * A135115 A135116 A135117

Keyword

nonn,more

Author

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

Extensions

Term 13600 from Robert Price, Mar 22 2010

Terms 1003, 1523, 2225, 6793, 7018 inserted by Robert Price, Oct 31 2010

Edited by Ray Chandler, Dec 23 2010

a(21)=76801 from Robert Price, Mar 03 2011

Status

approved