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A186538 Numbers n>0 such that 666*10^n+7 is prime. 1
25, 26, 28, 33, 49, 80, 81, 133, 179, 202, 222, 271, 411, 588, 682, 1039, 2403, 5802, 11544, 12484, 41047, 46396 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Some of the larger entries may only correspond to probable primes.

LINKS

Table of n, a(n) for n=1..22.

Chris Caldwell, The Prime Glossary, Beastly prime

G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 66600...00007 (28-digits)

Henri & Renaud Lifchitz, PRP Records

R. Ondrejka, The Top Ten: a Catalogue of Primal Configurations

MATHEMATICA

Select[Range[10^3], PrimeQ[666*10^# + 7] &] (* Arkadiusz Wesolowski, Sep 08 2011 *)

CROSSREFS

Cf. A186086.

Sequence in context: A140058 A199992 A242221 * A340271 A003996 A132415

Adjacent sequences:  A186535 A186536 A186537 * A186539 A186540 A186541

KEYWORD

more,nonn,base

AUTHOR

Arkadiusz Wesolowski, Feb 23 2011

EXTENSIONS

Added a(21)=41047, Arkadiusz Wesolowski, May 25 2011.

Added a(22)=46396, Arkadiusz Wesolowski, May 28 2011.

STATUS

approved

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Last modified September 16 21:28 EDT 2021. Contains 347473 sequences. (Running on oeis4.)