|
Search: id:A065219
|
|
|
| A065219 |
|
Number of subsets of proper divisors of numbers in A065218 summing to the number. |
|
+0
2
|
|
| 1, 2, 5, 7, 10, 34, 278, 751, 2157, 22208, 676327, 2225346, 23259536, 265050967, 39161483067, 70455119174849, 776384598617893, 133991542908557129, 21819590324155207874, 263763825614848727692, 12883245190231409112736, 661394651111310011564685
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
The numbers themselves are in A065218.
|
|
FORMULA
|
a(n) = A065205(A065218(n))
|
|
EXAMPLE
|
Proper divisors of 12 are {1,2,3,4,6}. Two subsets of this sum to 12: {2,4,6} and {1,2,3,6} - more than any smaller number, so 2 is in the sequence (and 12 is in A065218).
|
|
CROSSREFS
|
Cf. A065218, A064771, A063205, A005835, A002182, A004394.
Sequence in context: A156779 A076802 A024374 this_sequence A013660 A124203 A155085
Adjacent sequences: A065216 A065217 A065218 this_sequence A065220 A065221 A065222
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Jud McCranie (j.mccranie(AT)comcast.net), Oct 21 2001
|
|
EXTENSIONS
|
Extended by Max Alekseyev (maxale(AT)gmail.com), May 29 2009
|
|
|
Search completed in 0.002 seconds
|
