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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A070935 Largest proper divisor of n^2. 2
2, 3, 8, 5, 18, 7, 32, 27, 50, 11, 72, 13, 98, 75, 128, 17, 162, 19, 200, 147, 242, 23, 288, 125, 338, 243, 392, 29, 450, 31, 512, 363, 578, 245, 648, 37, 722, 507, 800, 41, 882, 43, 968, 675, 1058, 47, 1152, 343, 1250, 867, 1352, 53, 1458, 605, 1568, 1083, 1682 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Computable as largest value of GCD[n^2,j] for j=1+n^2,...,-1+2*n^2.

LINKS

Robert Israel, Table of n, a(n) for n = 2..10000

FORMULA

a(n)=A032742[n^2]=n*A032742[n]

MAPLE

f:= n -> n^2/min(numtheory:-factorset(n)):

map(f, [$2..100]); # Robert Israel, Jan 02 2019

MATHEMATICA

Table[Max[Table[GCD[n^2, w], {w, n^2+1, 2*n^2-1}]], {n, 2, 128}]

CROSSREFS

Cf. A032742.

Sequence in context: A004730 A168014 A050369 * A095164 A075384 A072500

Adjacent sequences:  A070932 A070933 A070934 * A070936 A070937 A070938

KEYWORD

nonn

AUTHOR

Labos Elemer, May 22 2002

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 November 12 19:24 EST 2019. Contains 329078 sequences. (Running on oeis4.)