A159265 Google primes: primes of the form 379*10^n+9 = 3790...09.

379009, 379000009, 37900000009, 379000000009, 3790000000000000000000000000000000000009, 37900000000000000000000000000000000000000000009, 3790000000000000000000000000000000000000000000000000000000000000000009

Offset

1,1

Comments

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.

References

J. Earls, Mathematical Bliss, Pleroma Publications, 2009, pages 15-17. ASIN: B002ACVZ6O [From Jason Earls, Nov 21 2009]

Links

Table of n, a(n) for n=1..7.

G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 379009

Formula

a(n) = 379*10^A159264(n)+9.

Mathematica

Select[Table[379*10^n + 9, {n, 3, 70}], PrimeQ] (* Arkadiusz Wesolowski, Oct 05 2011 *)

Prog

(PARI) for( n=0, 99, ispseudoprime(379*10^n+9) & print1(379*10^n+9, ", "))

Crossrefs

Sequence in context: A133975 A133977 A133978 * A133976 A286009 A295454

Adjacent sequences: A159262 A159263 A159264 * A159266 A159267 A159268

Keyword

nonn,word

Author

M. F. Hasler, Apr 07 2009

Status

approved