|
Search: id:A158963
|
|
| |
|
| 2993, 63254, 63792, 82213, 104728, 130811, 135767, 137994, 149813, 156335, 193041, 193776, 199879
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
What is the first number n such that A160691(n) isn't in the set {1,2,6,8,12}?
|
|
MATHEMATICA
|
c[1]=1; c[n_]:=c[n]=(s=Sum[c[k], {k, n-1}]; For[m=1, DivisorSigma[0, m]!=
DivisorSigma[0, s+m], m++ ]; m); Do[If[DivisorSigma[0, c[n]]==12, Print[n]], {n, 210000}]
|
|
CROSSREFS
|
Cf. A158964, A160689, A160690, A160691.
Sequence in context: A120373 A108926 A159731 this_sequence A063055 A031130 A106766
Adjacent sequences: A158960 A158961 A158962 this_sequence A158964 A158965 A158966
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Farideh Firoozbakht (mymontain(AT)yahoo.com), May 28 2009
|
|
|
Search completed in 0.002 seconds
|
