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!)
A100777 Square-factorial numbers: a(1) = 1, a(n+1) = a(n) * largest square divisor of (n+1). 1
1, 1, 1, 4, 4, 4, 4, 16, 144, 144, 144, 576, 576, 576, 576, 9216, 9216, 82944, 82944, 331776, 331776, 331776, 331776, 1327104, 33177600, 33177600, 298598400, 1194393600, 1194393600, 1194393600, 1194393600, 19110297600, 19110297600, 19110297600, 19110297600 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Complementary to A048803 which can be defined as squarefree factorials.
Partial products of A008833. - Ray Chandler, Nov 29 2004
LINKS
MATHEMATICA
f[p_, e_] := p^(2*Floor[e/2]); s[n_] := Times @@ (f @@@ FactorInteger[n]); FoldList[Times, 1, Array[s, 31, 2]] (* Amiram Eldar, Dec 07 2020 *)
CROSSREFS
Sequence in context: A115639 A242954 A062732 * A309501 A024727 A024552
KEYWORD
easy,nonn
AUTHOR
Amarnath Murthy, Nov 28 2004
EXTENSIONS
More terms from Amiram Eldar, Dec 07 2020
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 March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)