

A110983


Integers n such that 5*10^n + 51 is prime.


0



1, 3, 4, 16, 430, 727, 1415, 2691, 3160, 3904, 5464, 19875, 65255, 68524
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OFFSET

1,2


COMMENTS

See Kamada link  primecount.txt for terms, primesize.txt for discovery details including probable or proved primes  search on "50051".
a(15) > 10^5.  Robert Price, Jan 28 2017


LINKS

Table of n, a(n) for n=1..14.
Makoto Kamada, List of nearrepdigitrelated prime numbers.
Index entries for primes involving repunits.


EXAMPLE

n = 4 is a member because: 5*10^4+51 = 5*10000+51 = 50000+51 = 50051, which is prime.


MATHEMATICA

Select[Range[1, 1000], PrimeQ[5*10^# + 51] &] (* Julien Kluge, Dec 15 2016 *)


CROSSREFS

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054.
Sequence in context: A353155 A252606 A248240 * A100560 A025534 A082000
Adjacent sequences: A110980 A110981 A110982 * A110984 A110985 A110986


KEYWORD

more,nonn


AUTHOR

Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005


EXTENSIONS

a(11)a(12) from Ray Chandler, Dec 23 2010
Prepended a(1)=1 by Robert Price, Jan 28 2017
a(13)a(14) from Robert Price, Jan 28 2017


STATUS

approved



