A027665 a(n)/100000 gives log_10(n) to 5 places.

0, 30103, 47712, 60206, 69897, 77815, 84510, 90309, 95424, 100000, 104139, 107918, 111394, 114613, 117609, 120412, 123045, 125527, 127875, 130103, 132222, 134242, 136173, 138021, 139794, 141497, 143136, 144716, 146240

Offset

1,2

Comments

A tribute to 5-place logarithm tables which served many generations of students and technical people. - Michael Somos, Sep 21 2002

a(10*n) = a(n) + 100000, virtually. - Reinhard Zumkeller, Nov 12 2011

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Common Logarithm

Wikipedia, Common logarithm

Wikipedia, Tables of logarithms

Maple

lprint(round(evalf(100000*log(n)/log(10))));

Prog

(PARI) a(n)=if(n<1, 0, round(10^5*log(n)/log(10)))
(Haskell)
a027665 n = round $ 100000 * log (fromInteger n) / (log 10)
-- Reinhard Zumkeller, Nov 12 2011

Crossrefs

Sequence in context: A066576 A104877 A237031 * A260459 A202598 A298429

Adjacent sequences: A027662 A027663 A027664 * A027666 A027667 A027668

Keyword

nonn,base

Author

N. J. A. Sloane

Status

approved