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A068689 Primes which are a sandwich of numbers made of only one decimal digit between two 9's. 0
919, 929, 9222229, 9888889, 9222222222229, 9888888888888888888888888888888888888888888888888888888888888888888888889, 9888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888889 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

Cf. A068685, A068687, A068688.

Sequence in context: A179673 A082518 A128375 * A088284 A020399 A084843

Adjacent sequences:  A068686 A068687 A068688 * A068690 A068691 A068692

KEYWORD

nonn,base

AUTHOR

Amarnath Murthy, Mar 02 2002

EXTENSIONS

More terms from Sascha Kurz, Mar 17 2002

STATUS

approved

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)