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A078814 Smallest prime factor of Googolplex - n which exceeds 16. 1
17, 1433, 499679, 1279, 31, 149 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..6.

Dario Alejandro Alpern, Factors of 1000 numbers up to googolplex.

MATHEMATICA

(* For any individual n *) k = 17; While[ !PrimeQ[k] || PowerMod[10, 10^100, k] - n != 0, k += 2]; k

CROSSREFS

Cf. A072288.

Sequence in context: A269791 A256020 A072160 * A242282 A129911 A104808

Adjacent sequences:  A078811 A078812 A078813 * A078815 A078816 A078817

KEYWORD

hard,nonn,more

AUTHOR

Ed Pegg Jr and Robert G. Wilson v, Dec 06 2002

EXTENSIONS

Seventh term is not known. Sequence continues ?, 625392489737, 19, 37, 5419, 107, 23, 60149, 1733, 89, 8543, 17, 5261, 229, 8656871, 4273, 14009, 29, 509, 43628661784403, 24539783, 19, 347, 12414692011, 523, 151, 421, 35816135619181, 17, 23, 184309, ?, 181, 288481, 163, 41, 743, 13337, 71, 53, 19, 59, 113, 37957721, ... where the unknown numbers exceed 25 x 10^12. - Dario Alpern, Jul 03 2003

STATUS

approved

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Last modified October 22 13:06 EDT 2018. Contains 316459 sequences. (Running on oeis4.)