A135132 Integers n such that 10^n + 73 is a prime number.

1, 2, 8, 11, 145, 695, 1099, 3518, 6211, 13015

Offset

1,2

Comments

a(5) to a(7) were certified prime with PRIMO. - Bernardo Boncompagni, Nov 07 2008

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 "10073".

Links

Table of n, a(n) for n=1..10.

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

Index entries for primes involving repunits.

Example

8 is a member because 10^8+73 = 100000000+73 = 100000073, which is prime.

Mathematica

Select[Range[1000], PrimeQ[10^# + 73] &] (* G. C. Greubel, Sep 28 2016 *)

Crossrefs

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

Sequence in context: A332098 A254313 A209429 * A178060 A007543 A352549

Adjacent sequences: A135129 A135130 A135131 * A135133 A135134 A135135

Keyword

more,nonn

Author

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

Extensions

a(7) from Bernardo Boncompagni, Nov 07 2008

Added term 13015. Robert Price, Mar 22 2010

Added two terms: 3518,6211. Robert Price, Oct 10 2010

Edited by Ray Chandler, Dec 23 2010

Status

approved