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A159265
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Google primes: primes of the form 379*10^n+9 = 3790...09.
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1
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379009, 379000009, 37900000009, 379000000009, 3790000000000000000000000000000000000009, 37900000000000000000000000000000000000000000009, 3790000000000000000000000000000000000000000000000000000000000000000009
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The prime number 379009 rotated by 180 degree reads "GOOGLE". This sequence gives primes of this form with a string of 0's of arbitrary length, as it appears (upside down) on the web site of the search engine to browse the pages of available search results.
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REFERENCES
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J. Earls, Mathematical Bliss, Pleroma Publications, 2009, pages 15-17. ASIN: B002ACVZ6O [From Jason Earls (zevi_35711(AT)yahoo.com), Nov 21 2009]
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LINKS
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Table of n, a(n) for n=1..7.
Jason Earls, Google-Primes, March 2008.
G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 379009
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FORMULA
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a(n) = 379*10^A159264(n)+9.
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MATHEMATICA
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Select[Table[379*10^n + 9, {n, 3, 70}], PrimeQ] (* Arkadiusz Wesolowski, Oct 05 2011 *)
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PROG
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(PARI) for( n=0, 99, ispseudoprime(379*10^n+9) & print1(379*10^n+9, ", "))
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CROSSREFS
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Sequence in context: A133975 A133977 A133978 * A133976 A206365 A205759
Adjacent sequences: A159262 A159263 A159264 * A159266 A159267 A159268
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KEYWORD
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nonn,word
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AUTHOR
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M. F. Hasler, Apr 07 2009
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STATUS
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approved
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