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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108462 Number of factorizations of (n,n) into pairs (i,j) with i,j>=1, not both 1. 2
1, 2, 2, 9, 2, 15, 2, 31, 9, 15, 2, 92, 2, 15, 15, 109, 2, 92, 2, 92, 15, 15, 2, 444, 9, 15, 31, 92, 2, 203, 2, 339, 15, 15, 15, 712, 2, 15, 15, 444, 2, 203, 2, 92, 92, 15, 2, 1903, 9, 92, 15, 92, 2, 444, 15, 444, 15, 15, 2, 1663, 2, 15, 92, 1043, 15, 203, 2, 92, 15, 203, 2 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

(a,b)*(x,y)=(a*x,b*y)

a(n) depends only on prime signature of n (cf. A025487). So a(24) = a(375) since 24=2^3*3 and 375=3*5^3 both have prime signature (3,1).

CROSSREFS

Main diagonal of A108461. a(A025487)=A108463. a(p^k)=A002774(k). a(A002110)=A020557.

Sequence in context: A037290 A155936 A167594 * A011403 A113554 A085846

Adjacent sequences:  A108459 A108460 A108461 * A108463 A108464 A108465

KEYWORD

nonn

AUTHOR

Christian G. Bower (bowerc(AT)usa.net), Jun 03 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 23:21 EST 2012. Contains 205860 sequences.