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A110933
Integers k such that 3*10^k + 71 is a prime number.
0
1, 4, 7, 16, 19, 190, 227, 235, 283, 319, 1655, 3955, 10666, 30724
OFFSET
1,2
COMMENTS
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "30071".
a(15) > 10^5. - Robert Price, Jan 22 2017
EXAMPLE
k = 7 is a member because: 3*10^7 + 71 = 30000071, which is prime.
PROG
(PARI) isok(n) = isprime(3*10^n+71); \\ Michel Marcus, Jan 22 2017
KEYWORD
more,nonn
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005
EXTENSIONS
a(13) from Ray Chandler, Dec 23 2010
Prepended a(1)=1 by Robert Price, Jan 22 2017
a(14) from Robert Price, Jan 22 2017
STATUS
approved