A159264 Numbers n such that 379*10^n+9 is a ("Google") probable prime.

3, 6, 8, 9, 37, 44, 67, 111, 157, 289, 1256, 1602, 2410, 2482, 2868, 3824, 3891, 6595, 8984, 9318, 10274, 45858, 59152, 86691, 99952, 110616, 114735, 213199

Offset

1,1

Comments

The prime number 379009 rotated by 180 degree reads "GOOGLE". This sequence gives n such that "GO...OGLE" with n-1 O's is prime.

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..28.

Henri & Renaud Lifchitz, PRP Records

Mathematica

Select[Range[3, 300], PrimeQ[379*10^# + 9] &] (* Arkadiusz Wesolowski, Oct 05 2011 *)

Prog

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

Crossrefs

A159265 lists the actual primes.

Sequence in context: A196370 A005622 A072960 * A329500 A287362 A055073

Adjacent sequences: A159261 A159262 A159263 * A159265 A159266 A159267

Keyword

nonn,hard,more,changed

Author

M. F. Hasler, Apr 07 2009

Extensions

a(22)-a(24) from Arkadiusz Wesolowski, Oct 15 2011

a(25)-a(28) from Jason Yuen, Jan 06 2025

Status

approved