login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A067715 Numbers k such that the sum of exponents in the prime factorization of k is < log(k). 1
3, 5, 7, 9, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
9 is included because the sum of the exponents in the prime factorization of 9 is 2, which is < log(9).
MATHEMATICA
Select[Range[100], Total[Transpose[FactorInteger[#]][[2]]]<Log[#]&] (* Harvey P. Dale, Feb 01 2015 *)
CROSSREFS
Cf. A067712.
Sequence in context: A326980 A281005 A080259 * A344291 A231564 A325798
KEYWORD
nonn
AUTHOR
Leroy Quet, Feb 05 2002
EXTENSIONS
Definition extended and offset changed to 1 by Georg Fischer, Feb 01 2024
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 13 20:16 EDT 2024. Contains 371645 sequences. (Running on oeis4.)