login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A081330 Numbers that can be written as sum of two 3-smooth numbers. 8
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 59, 60, 62, 63, 64, 65, 66, 67, 68, 70, 72, 73, 74, 75, 76, 78, 80, 81, 82 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

A081326(a(n))>0; complement of A081329.

LINKS

Ivars Peterson, Medieval Harmony.

Eric Weisstein's World of Mathematics, Smooth Number.

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

FORMULA

a(n) >> exp(n^(1/4)) [Charles R Greathouse IV, Aug 22 2011]

CROSSREFS

Cf. A003586, A081332, A081333, A081327, A081328.

Sequence in context: A048242 A132264 A004830 * A080682 A038770 A193176

Adjacent sequences:  A081327 A081328 A081329 * A081331 A081332 A081333

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 19 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 12:41 EST 2012. Contains 205909 sequences.