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A093948
Primes of the form 9*10^k - 1.
0
89, 8999, 89999999, 89999999999999999999, 899999999999999999999999999999, 89999999999999999999999999999999999999, 8999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
OFFSET
1,1
COMMENTS
Equivalently, primes of the form 8*10^k + 9*R_k, where R_k is the repunit (A002275) of length k.
CROSSREFS
Cf. A056725 (corresponding k).
Sequence in context: A264020 A020472 A263431 * A116254 A086695 A056568
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Apr 17 2004
STATUS
approved