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A123366 Primes of the form 10*(10^(x+1)+10^x-1)+7. 0
1097, 1099997, 10999997, 1099999997, 1099999999999999999999997, 10999999999999999999999997, 1099999999999999999999999999999999999999997, 10999999999999999999999999999999999999999999999999999999999999999997 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

10(10^803+10^802-1)+7 is the largest PRP with less than 1000 digits.

LINKS

Table of n, a(n) for n=1..8.

PROG

(PARI) g(n) = for(x=1, n, y=10*(10^(x+1)+10^x-1)+7; if(ispseudoprime(y), print1(y", ")))

CROSSREFS

Sequence in context: A184470 A234722 A160370 * A186476 A096926 A249287

Adjacent sequences:  A123363 A123364 A123365 * A123367 A123368 A123369

KEYWORD

nonn

AUTHOR

Cino Hilliard, Oct 12 2006

STATUS

approved

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Last modified March 26 14:18 EDT 2019. Contains 321497 sequences. (Running on oeis4.)