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A093948 Primes of the form 9*10^n - 1. 0
89, 8999, 89999999, 89999999999999999999, 899999999999999999999999999999, 89999999999999999999999999999999999999, 8999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Equivalently, primes of the form 8*10^n + 9*R_n, where R_n is the repunit (A002275) of length n.

LINKS

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

Makoto Kamada, Prime numbers of the form 899...999.

Index entries for primes involving repunits

CROSSREFS

Cf. A056725 (corresponding n).

Sequence in context: A264020 A020472 A263431 * A116254 A086695 A056568

Adjacent sequences:  A093945 A093946 A093947 * A093949 A093950 A093951

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 17 2004

STATUS

approved

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Last modified September 17 22:53 EDT 2019. Contains 327147 sequences. (Running on oeis4.)