|
| |
|
|
A139149
|
|
Integer of the form (n!+2)/2.
|
|
23
| |
|
|
2, 4, 13, 61, 361, 2521, 20161, 181441, 1814401, 19958401, 239500801, 3113510401, 43589145601, 653837184001, 10461394944001, 177843714048001, 3201186852864001, 60822550204416001, 1216451004088320001
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 2,1
|
|
|
COMMENTS
| Numbers of the form (n!+m)/m:
m=1 numbers of the form (n!+1)/1 see A038507
m=2 numbers of the form (n!+2)/2 see A139149
m=3 numbers of the form (n!+3)/3 see A139150
m=4 numbers of the form (n!+4)/4 see A139151
m=5 numbers of the form (n!+5)/5 see A139152
m=6 numbers of the form (n!+6)/6 see A139153
m=7 numbers of the form (n!+7)/7 see A139154
m=8 numbers of the form (n!+8)/8 see A139155
m=9 numbers of the form (n!+9)/9 see A139156
m=10 numbers of the form (n!+10)/10 see A139157
Offsets for above sequences are Kempner (or Smarandache) numbers A002034
For smallest integer number of the form (m!+n)/n see A139148.
|
|
|
EXAMPLE
| (1!+2)/2=3/2 is not an integer, a(1)=(2!+2)/2=2
|
|
|
MATHEMATICA
| Table[(n! + 2)/2, {n, 2, 30}]
|
|
|
CROSSREFS
| Cf. A082672, A089085, A089130, A117141, A007749, A139056, A139057, A139058, A139059, A139060, A139061, A139061, A139062, A139063, A139064, A139065, A139066, A020458, A139068, A137390, A139070, A139071, A139072, A139073, A139074, A139075, A139148, A139149, A139150, A139151, A139152, A139153, A139154, A139155, A139156, A139157, A139158, A139158, A139159, A139160, A139161, A139162.
Sequence in context: A201691 A020120 A020097 * A132786 A103845 A055463
Adjacent sequences: A139146 A139147 A139148 * A139150 A139151 A139152
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 11 2008
|
| |
|
|
