

A286959


Positive numbers k such that (10^(k+3)*3277 + 3167)/9 is prime.


0



11, 17, 197, 317, 347, 431, 977, 1949, 1991, 2913, 6317, 9725, 36599
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OFFSET

1,1


COMMENTS

Or '364'...'1'...'463' in decimal form is prime ('1' concatenated k times to which the prefix '364' and the suffix '463' are concatenated once).
a(1)..a(8) themselves are primes.


LINKS



EXAMPLE

11 is a term as 36411111111111463 is prime (as a string, it consists of '1' concatenated 11 times to which the prefix '364' and the suffix '463' are concatenated once).


MATHEMATICA

ParallelMap[ If[ PrimeQ[(10^(#+3)*3277+3167)/9], #, Nothing]&, Range[3000]]


PROG



CROSSREFS



KEYWORD

nonn,hard,more,base


AUTHOR



EXTENSIONS



STATUS

approved



