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A151799
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Version 2 of the "previous prime" function: largest prime < n.
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11
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2, 3, 3, 5, 5, 7, 7, 7, 7, 11, 11, 13, 13, 13, 13, 17, 17, 19, 19, 19, 19, 23, 23, 23, 23, 23, 23, 29, 29, 31, 31, 31, 31, 31, 31, 37, 37, 37, 37, 41, 41, 43, 43, 43, 43, 47, 47, 47, 47, 47, 47, 53, 53, 53, 53, 53, 53, 59, 59, 61, 61, 61, 61, 61, 61, 67, 67, 67, 67, 71, 71, 73, 73, 73, 73
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,1
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COMMENTS
| Version 1 of the "previous prime" function is "largest prime <= n". This produces A007917, the same sequence of numerical values, except the offset (or indexing) starts at 2 instead of 3.
Maple's "prevprime" function uses version 2.
See A007917 for references and further information.
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LINKS
| Daniel Forgues, Table of n, a(n) for n=3..100000
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MAPLE
| A151799 := n-> prevprime(n);
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MATHEMATICA
| Table[NextPrime[n, -1], {n, 3, 77}] (* From Jean-François Alcover, May 27 2011 *)
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PROG
| (Maxima) makelist(prev_prime(n), n, 3, 79); [Bruno Berselli, May 20 2011]
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CROSSREFS
| Cf. A000040, A007917, A007918, A151800.
Sequence in context: A093074 A136548 A007917 * A093841 A091937 A113637
Adjacent sequences: A151796 A151797 A151798 * A151800 A151801 A151802
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KEYWORD
| nonn,easy,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 29 2009
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