login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A135112 Integers n such that 10^n+93 is a prime number. 1
1, 2, 3, 4, 9, 61, 78, 116, 632, 1184, 2034, 3870, 3914, 6456, 12464, 58250 (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 "10093".

LINKS

Table of n, a(n) for n=1..16.

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

Index entries for primes involving repunits.

EXAMPLE

4 is a member: 10^4+93 = 10000+93 = 10093, which is a prime number.

MATHEMATICA

Select[Range[2000], PrimeQ[10^# + 93] &] (* Vincenzo Librandi, Nov 02 2014 *)

PROG

(MAGMA) [n: n in [1..500]| IsPrime(10^n+93)]; // Vincenzo Librandi, Nov 02 2014

CROSSREFS

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

Sequence in context: A076018 A076017 A245366 * A286709 A082865 A265348

Adjacent sequences:  A135109 A135110 A135111 * A135113 A135114 A135115

KEYWORD

more,nonn

AUTHOR

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

EXTENSIONS

a(1)=1 added by Vladimir Joseph Stephan Orlovsky, May 02 2008

a(4) corrected by Vladimir Joseph Stephan Orlovsky, May 02 2008

a(10)-a(15) by Robert Price, Dec 12 2010

Edited by Ray Chandler, Dec 23 2010

a(16)=58250 from Robert Price, Jan 29 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified September 26 05:09 EDT 2017. Contains 292502 sequences.