|
| |
|
|
A110757
|
|
a(n) = tau(N), where N = reverse concatenation of 1,2,3,...,n.
|
|
4
| |
|
|
1, 4, 4, 4, 8, 4, 4, 12, 18, 8, 4, 8, 8, 16, 48, 16, 96, 576, 16, 32, 16, 32, 16, 32, 64, 256, 96, 32, 128, 256, 8, 64, 32, 128, 384, 144, 16, 8, 64, 32, 256, 64, 8, 192, 96
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
EXAMPLE
| a(3) = tau(321) = 4.
|
|
|
MATHEMATICA
| s = ""; Do[s = ToString[n] <> s; Print[DivisorSigma[0, ToExpression[s]]], {n, 1, 45}] (Propper)
|
|
|
CROSSREFS
| Cf. A110756, A110758, A110759, A110760.
Sequence in context: A128939 A105352 A132200 * A167184 A085071 A011412
Adjacent sequences: A110754 A110755 A110756 * A110758 A110759 A110760
|
|
|
KEYWORD
| base,nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 11 2005
|
|
|
EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu), Sep 23 2005
|
| |
|
|
