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A065592 Smallest prime beginning with exactly n 9's. 12
2, 97, 991, 99901, 99991, 9999901, 9999991, 999999929, 9999999929, 99999999907, 999999999937, 9999999999971, 99999999999923, 999999999999947, 9999999999999917, 99999999999999919, 99999999999999997, 9999999999999999919, 99999999999999999931 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
MATHEMATICA
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 *)
CROSSREFS
Sequence in context: A189313 A042151 A233192 * A233767 A223936 A224083
KEYWORD
nonn,base
AUTHOR
Robert G. Wilson v, Nov 28 2001
EXTENSIONS
Corrected by Don Reble, Jan 17 2007
Offset corrected by Sean A. Irvine, Sep 06 2023
STATUS
approved

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)