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A110949
Integers n such that 4*10^n + 61 is prime.
0
1, 2, 7, 11, 191, 248, 1067, 2666, 5252, 13400, 22886, 23739, 29095
OFFSET
1,2
COMMENTS
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "40061".
a(14) > 10^5. - Robert Price, Jan 22 2017
EXAMPLE
n = 7 is in the sequence because 4*10^7 + 61 = 4*10000000 + 61 = 40000000 + 61 = 40000061, which is prime.
PROG
(PARI) isok(n) = isprime(4*10^n+61); \\ Michel Marcus, Jan 22 2017
KEYWORD
more,nonn
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005
EXTENSIONS
a(9)-a(11) from Ray Chandler, Dec 23 2010
Prepended a(1)=1 by Robert Price, Jan 22 2017
a(12)-a(13) from Robert Price, Jan 22 2017
STATUS
approved