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A003619
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Not of form [ e^m ], m >= 1.
(Formerly M2300)
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2
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1, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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REFERENCES
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J. Roberts, Lure of the Integers, Math. Assoc. America, 1992, p. 11.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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a(n) = n + [ log (n + 1 + [ log (n + 1) ]) ].
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MATHEMATICA
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Table[n + Floor@ Log[n + 1 + Floor@ Log[n + 1]], {n, 50}] (* Michael De Vlieger, Oct 06 2017 *)
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PROG
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(PARI) a(n) = n + floor( log (n + 1 + floor( log (n + 1) )) ) \\ Michel Marcus, Jun 16 2013
(Haskell)
a003619 n = n + floor (log (x + fromIntegral (floor $ log x)))
where x = fromIntegral n + 1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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