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A145851
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Primes of the form k followed by k 9's.
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2
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OFFSET
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1,1
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COMMENTS
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Corresponding k, which cannot be multiples of 3, are in A174352. The next term has 176 digits, too large to include here. - Rick L. Shepherd, Mar 22 2010
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LINKS
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Table of n, a(n) for n=1..6.
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PROG
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(PARI) lista(nn) = for(k=1, nn, if(ispseudoprime(q=k*10^(k-1)-1), print1(q, ", "))); \\ Jinyuan Wang, Mar 24 2020
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CROSSREFS
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Cf. A141311, A145852.
Cf. A174352. - Rick L. Shepherd, Mar 22 2010
Sequence in context: A203703 A068734 A216529 * A182374 A034207 A098970
Adjacent sequences: A145848 A145849 A145850 * A145852 A145853 A145854
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KEYWORD
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nonn,base
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AUTHOR
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Lekraj Beedassy, Oct 21 2008
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EXTENSIONS
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a(2) was 4999; corrected by Rick L. Shepherd, Mar 22 2010
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STATUS
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approved
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