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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A193745 Smallest k  such that k*n! +1 is an n-th power. 0
1, 4, 57, 26, 216145205, 1232644, 16412938630073477961847, 1678453230184, 5043695769339201738285763848771292, 38634088549546746345278764872265967473783 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

a(3) = 57 because 57*3!+1 = 343 = 7^3.

MATHEMATICA

a={}; Do[k = 2; While[ !IntegerQ[(k^n - 1)/n!], k++ ]; AppendTo[a, (k^n-1)/n!], {n, 1, 10}]; a

CROSSREFS

Sequence in context: A071579 A060497 A092273 * A181437 A156873 A071540

Adjacent sequences:  A193742 A193743 A193744 * A193746 A193747 A193748

KEYWORD

nonn

AUTHOR

Michel Lagneau, Aug 03 2011

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 8 06:50 EST 2016. Contains 278902 sequences.