A135119 Integers n such that 10^n+57 is a prime number.

1, 2, 5, 11, 22, 30, 31, 43, 44, 64, 107, 191, 2149, 3174, 4952, 12126, 29884, 32645, 48442, 60959, 62750, 87408, 95326

Offset

1,2

Comments

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10057".

No additional terms <100000.

Links

Table of n, a(n) for n=1..23.

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

Index entries for primes involving repunits.

Example

5 is a member because 10^5+57 = 100000+57 = 100057, which is a prime number.

Crossrefs

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

Sequence in context: A049936 A058358 A292528 * A290778 A291590 A236430

Adjacent sequences: A135116 A135117 A135118 * A135120 A135121 A135122

Keyword

more,nonn

Author

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

Extensions

Four PRP terms from Sean A. Irvine, Nov 11 2009

Added term 60959. Robert Price, Mar 22 2010

Added terms 29884,32645. Robert Price, Aug 24 2010

Edited by Ray Chandler, Dec 23 2010

a(19)=48442 from Robert Price, Dec 31 2010

a(21)=62750 from Robert Price, Jan 29 2011

a(22)=87408 from Robert Price, Mar 03 2011

a(23)=95326 from Robert Price, Mar 24 2011

Deleted superseded comment. - Harvey P. Dale, Apr 23 2022

Status

approved