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A121044
Greatest cluster prime less than 10^n.
2
7, 89, 983, 9931, 99991, 999331, 9997879, 99999551, 999998693, 9999995363, 99999976319, 999999998533, 9999999954787
OFFSET
1,1
COMMENTS
These numbers are useful for generating intermediate cluster primes because the best algorithm for generating cluster primes requires starting with a known cluster prime.
CROSSREFS
Cf. A038134 (cluster primes), A039506 (number of cluster primes < 10^n), A121045.
Sequence in context: A178006 A053302 A068877 * A107109 A089771 A249448
KEYWORD
nonn
AUTHOR
T. D. Noe, Jul 21 2006
STATUS
approved