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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
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
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
KEYWORD
nonn,base,more
AUTHOR
EXTENSIONS
a(21) from Arkadiusz Wesolowski, May 25 2011
a(22) from Arkadiusz Wesolowski, May 28 2011
STATUS
approved

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Last modified April 13 23:25 EDT 2024. Contains 371652 sequences. (Running on oeis4.)