|
Search: id:A130770
|
|
|
| A130770 |
|
One third of the lowest common multiple of 3 and n^2+n+1. |
|
+0
1
|
|
| 1, 1, 7, 13, 7, 31, 43, 19, 73, 91, 37, 133, 157, 61, 211, 241, 91, 307, 343, 127, 421, 463, 169, 553, 601, 217, 703, 757, 271, 871, 931, 331, 1057, 1123, 397, 1261, 1333, 469, 1483, 1561, 547, 1723, 1807, 631, 1981, 2071, 721, 2257, 2353, 817, 2551, 2653, 919
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
COMMENT
|
This is a subset of A051176 and is also one third of A130723.
|
|
FORMULA
|
Conjecture: a(n)=A046163(n), n>0. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 13 2008
|
|
EXAMPLE
|
a(4)=7 because 4^2+4+1 =21, the LCM of 3 and 21 is 21 and 21/3=7.
|
|
MAPLE
|
seq(denom((n-1)^2/(n^2+n+1)), n=0..52) ; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2008
|
|
CROSSREFS
|
Cf. A051176, A130723.
Sequence in context: A164929 A081257 A046163 this_sequence A158622 A122874 A066003
Adjacent sequences: A130767 A130768 A130769 this_sequence A130771 A130772 A130773
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Neville Holmes (neville.holmes(AT)utas.edu.au), Jul 14 2007
|
|
|
Search completed in 0.002 seconds
|
