login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A276108 Numbers expressible as perfect powers in a composite number of ways. 0
1, 65536, 43046721, 68719476736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Old title was "Values of A117453(n) such that A175066(n) is not a prime number."

Terms are 1, 2^16, 3^16, 2^36, ...

Numbers m^k, where m is not a perfect power and k is a composite number in A154893 or 0. - Charlie Neder, Mar 02 2019

LINKS

Table of n, a(n) for n=1..4.

EXAMPLE

65536 = 2^16 is a term because there are 4 corresponding ways that are 2^16, 4^8, 16^4, 256^2.

CROSSREFS

Cf. A117453, A154893, A175066.

Sequence in context: A017696 A211199 A010804 * A030635 A236224 A016964

Adjacent sequences:  A276105 A276106 A276107 * A276109 A276110 A276111

KEYWORD

nonn,more

AUTHOR

Altug Alkan, Aug 27 2016

EXTENSIONS

New title from Charlie Neder, Mar 04 2019

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 3 18:40 EDT 2020. Contains 333198 sequences. (Running on oeis4.)