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A003618
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Largest n-digit prime.
(Formerly M4452)
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31
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7, 97, 997, 9973, 99991, 999983, 9999991, 99999989, 999999937, 9999999967, 99999999977, 999999999989, 9999999999971, 99999999999973, 999999999999989, 9999999999999937, 99999999999999997, 999999999999999989, 9999999999999999961
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| O'Hara, J. Rec. Math., 22 (1990), Table on page 278.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..200 [Jon Schoenfield verfied that these numbers are indeed all primes, Feb 02 2009]
Eric Weisstein's World of Mathematics, Previous Prime
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MATHEMATICA
| Table[a := 10^(n + 1); While[ ! PrimeQ[a], a-- ]; a, {n, 0, 30}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 08 2006
NextPrime[#, -1]&/@(10^Range[20]) (* From Harvey P. Dale, Feb 03 2011 *)
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PROG
| (PARI) a(n)=precprime(10^n) \\ Charles R Greathouse IV, Jul 19 2011
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CROSSREFS
| Cf. A003617, A033874.
Sequence in context: A125590 A068694 A158579 * A173833 A093172 A074110
Adjacent sequences: A003615 A003616 A003617 * A003619 A003620 A003621
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KEYWORD
| nonn,nice,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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EXTENSIONS
| More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Apr 08 2006
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