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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108049 Integers n such that 10^n+43 is a prime number. 27
1, 5, 37, 253, 1129, 1441, 35393 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(8) > 10^5. - Robert Price, Nov 01 2013

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10043".

LINKS

Table of n, a(n) for n=1..7.

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

Index entries for primes involving repunits.

EXAMPLE

n = 5 is 10^5+43 = 100043, which is prime.

MATHEMATICA

Select[Range[2*10^3], PrimeQ[10^#+43]&] - Vladimir Joseph Stephan Orlovsky, Apr 29 2008

PROG

(PARI) is(n)=ispseudoprime(10^n+43) \\ Charles R Greathouse IV, Apr 28 2015

CROSSREFS

Cf. A049054, A088274, A088275.

Sequence in context: A183385 A054417 A080507 * A121141 A220634 A083232

Adjacent sequences:  A108046 A108047 A108048 * A108050 A108051 A108052

KEYWORD

nonn,more

AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Jun 01 2005

EXTENSIONS

a(7)=35393 from Robert Price, Mar 16 2010

Edited by Ray Chandler, Dec 23 2010

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.