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A171767 Numbers n such that 10^n*(3+7*10^n)+7 is prime. 0
0, 10, 18, 222, 1150, 7180 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The value corresponding to n=7180 was certified a Fermat and Lucas PRP with WinPFGW and submitted to Lifchitz's Top PRPs database.
LINKS
Table of n, a(n) for n=1..6.
PROG
(PARI) is(n)=ispseudoprime(10^n*(3+7*10^n)+7) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A233451 A177172 A358985 * A153689 A240022 A264386
Adjacent sequences: A171764 A171765 A171766 * A171768 A171769 A171770
KEYWORD
more,nonn
AUTHOR
Jason Earls, Dec 18 2009
STATUS
approved

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Last modified August 18 13:06 EDT 2024. Contains 375269 sequences. (Running on oeis4.)