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A135107 Integers n such that 10^n+97 is prime. 1
1, 2, 3, 9, 10, 14, 19, 67, 94, 201, 241, 589, 934, 1151, 1179, 4957, 6329, 13621, 26425 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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 "10097".

LINKS

Table of n, a(n) for n=1..19.

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

Index entries for primes involving repunits.

EXAMPLE

n = 3 is a member because 10^3+97 = 1000+97 = 1097, which is prime.

MATHEMATICA

Select[Range[2000], PrimeQ[10^# + 97] &] (* Vincenzo Librandi, Nov 02 2014 *)

PROG

(MAGMA) [n: n in [1..500]| IsPrime(10^n+97)]; // Vincenzo Librandi, Nov 02 2014

CROSSREFS

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

Sequence in context: A214433 A257026 A057291 * A191568 A279549 A030743

Adjacent sequences:  A135104 A135105 A135106 * A135108 A135109 A135110

KEYWORD

more,nonn

AUTHOR

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

EXTENSIONS

a(14)-a(19) from Robert Price, Nov 06 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.