|
Search: id:A053587
|
|
|
| A053587 |
|
Indices of A052344 (ways to write n as sum of two nonzero triangular numbers) where record values are reached. |
|
+0
7
|
|
| 2, 16, 81, 471, 1056, 1381, 6906, 17956, 34531, 40056, 200281, 520731, 1001406, 1482081, 7410406, 19267056, 37052031, 60765331, 303826656, 789949306, 1519133281, 3220562556, 13429138206, 16102812781
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
REFERENCES
|
The College Mathematics Journal Vol. 30 No. 5, Nov. 1999 Problem 665 asks for the 48th number in this sequence
|
|
EXAMPLE
|
The order of the terms is ignored when deciding in how many ways the sum can be expressed. For example, a(2) does not equal 9, although 9 = 3 + 6 = 6 + 3.
a(2) = 16 because 16 = 1 + 15 = 6 + 10, a(3) = 81 because 81 = 3 + 78 = 15 + 66 = 36 + 55
|
|
CROSSREFS
|
Probably differs from A052348 only at n=1, 2, 4. Cf. A000217, A052343-A052348.
Sequence in context: A045905 A012680 A012684 this_sequence A052346 A071893 A069440
Adjacent sequences: A053584 A053585 A053586 this_sequence A053588 A053589 A053590
|
|
KEYWORD
|
nonn,nice,easy
|
|
AUTHOR
|
Jeremy Rouse (jrouse(AT)hmc.edu), Jan 19 2000
|
|
EXTENSIONS
|
More terms from Christian G. Bower (bowerc(AT)usa.net), Jan 23 2000
|
|
|
Search completed in 0.002 seconds
|
