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A171735 Numbers n such that 10^n*(2+7*10^n)+7 is prime. 0
1, 2, 4, 19, 25, 47, 266, 2016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

No more terms up to n=7500.

LINKS

Table of n, a(n) for n=1..8.

PROG

(PARI) is(n)=ispseudoprime(10^n*(2+7*10^n)+7) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A153691 A184308 A268338 * A201379 A056727 A154140

Adjacent sequences:  A171732 A171733 A171734 * A171736 A171737 A171738

KEYWORD

more,nonn

AUTHOR

Jason Earls, Dec 17 2009

STATUS

approved

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Last modified September 22 16:50 EDT 2020. Contains 337291 sequences. (Running on oeis4.)