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A065592
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Smallest prime beginning with exactly n 9's.
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12
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2, 97, 991, 99901, 99991, 9999901, 9999991, 999999929, 9999999929, 99999999907, 999999999937, 9999999999971, 99999999999923, 999999999999947, 9999999999999917, 99999999999999919, 99999999999999997
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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M. F. Hasler, Table of n, a(n) for n = 1..201
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MATHEMATICA
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fp[n_]:=Select[Join[10*n+{1, 7}, 100*n+Range[1, 99, 2]], PrimeQ, 1]; With[{ns=Table[FromDigits[PadRight[{}, n, 9]], {n, 20}]}, Join[{2}, Flatten[fp/@ns]]] (* Harvey P. Dale, May 12 2012 *)
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CROSSREFS
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Cf. A037071, A065582, A065584 - A065591.
Sequence in context: A189313 A042151 A233192 * A233767 A223936 A224083
Adjacent sequences: A065589 A065590 A065591 * A065593 A065594 A065595
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KEYWORD
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nonn,base
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AUTHOR
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Robert G. Wilson v, Nov 28 2001
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EXTENSIONS
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Corrected by Don Reble, Jan 17 2007
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STATUS
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approved
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