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!)
A304254 Irregular triangle read by rows: row n lists divisors of n^2 in decreasing order. 0
1, 4, 2, 1, 9, 3, 1, 16, 8, 4, 2, 1, 25, 5, 1, 36, 18, 12, 9, 6, 4, 3, 2, 1, 49, 7, 1, 64, 32, 16, 8, 4, 2, 1, 81, 27, 9, 3, 1, 100, 50, 25, 20, 10, 5, 4, 2, 1, 121, 11, 1, 144, 72, 48, 36, 24, 18, 16, 12, 9, 8, 6, 4, 3, 2, 1, 169, 13, 1, 196, 98, 49, 28, 14 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
Triangle begins:
1;
4, 2, 1;
9, 3, 1;
16, 8, 4, 2, 1;
25, 5, 1;
36, 18, 12, 9, 6, 4, 3, 2, 1;
49, 7, 1;
64, 32, 16, 8, 4, 2, 1;
81, 27, 9, 3, 1;
100, 50, 25, 20, 10, 5, 4, 2, 1;
121, 11, 1;
144, 72, 48, 36, 24, 18, 16, 12, 9, 8, 6, 4, 3, 2, 1;
169, 13, 1;
196, 98, 49, 28, 14, 7, 4, 2, 1;
225, 75, 45, 25, 15, 9, 5, 3, 1;
256, 128, 64, 32, 16, 8, 4, 2, 1;
289, 17, 1;
324, 162, 108, 81, 54, 36, 27, 18, 12, 9, 6, 4, 3, 2, 1;
361, 19, 1;
400, 200, 100, 80, 50, 40, 25, 20, 16, 10, 8, 5, 4, 2, 1;
CROSSREFS
cf. A056538.
Sequence in context: A338255 A013659 A016505 * A010310 A021241 A016691
KEYWORD
nonn,tabf
AUTHOR
Kritsada Moomuang, May 09 2018
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 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)