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Search: id:A065219
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| A065219 |
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Number of subsets of proper divisors of numbers in A065218 summing to the number. |
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+0
2
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| 1, 2, 5, 7, 10, 34, 278, 751, 2157, 22208, 676327, 2225346, 23259536, 265050967
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The numbers themselves are A065218. a(15)>17864000000.
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EXAMPLE
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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).
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CROSSREFS
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Cf. A065218, A064771, A063205, A005835, A002182, A004394.
Sequence in context: A068817 A076802 A024374 this_sequence A013660 A124203 A077665
Adjacent sequences: A065216 A065217 A065218 this_sequence A065220 A065221 A065222
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KEYWORD
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hard,more,nonn
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net), Oct 21 2001
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