|
Search: id:A068077
|
|
|
| A068077 |
|
Numbers n such that sigma(n)+sigma(n+1)=4n. |
|
+0
3
|
|
| 1, 38184, 458010, 776112, 65676408, 1488668112, 4414086384, 28645019964
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
MATHEMATICA
|
For[n=1, True, n++, If[DivisorSigma[1, n]+DivisorSigma[1, n+1]==4n, Print[n]]]
|
|
CROSSREFS
|
Cf. A067806, A068078.
Sequence in context: A092682 A048526 A102332 this_sequence A094427 A138400 A050777
Adjacent sequences: A068074 A068075 A068076 this_sequence A068078 A068079 A068080
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Dean Hickerson (dean.hickerson(AT)yahoo.com), Feb 16 2002
|
|
EXTENSIONS
|
a(6)-a(8) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 31 2009
|
|
|
Search completed in 0.002 seconds
|
