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Search: id:A129749
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| A129749 |
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Numbers n that divide the sum of the first n nonprimes. |
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+0
1
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| 1, 8, 32, 44, 577, 5066, 5669, 8615, 39787, 59689, 109752, 146328, 15451380, 22173220, 28558717, 332573533, 1837410366, 3289933379
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A variant of A045345 and A053781.
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EXAMPLE
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The sum of the first 44 nonprimes is 1452 = 33*44.
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MAPLE
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np:=proc(j) if isprime(j)=false then j else fi end: NP:=[seq(np(j), j=1..50000)]: a:=proc(n) if type(add(NP[j], j=1..n)/n, integer)=true then n else fi end: seq(a(n), n=1..nops(NP)); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 16 2007
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CROSSREFS
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Cf. A045345 (n divides sum of first n primes), A053781 (n divides sum of first n composites), A018252 (nonprimes), A051349 (sum of first n nonprimes).
Sequence in context: A115948 A059880 A127988 this_sequence A005879 A067519 A009245
Adjacent sequences: A129746 A129747 A129748 this_sequence A129750 A129751 A129752
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KEYWORD
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nonn,more
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AUTHOR
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J. M. Bergot (thekingfishb(AT)yahoo.ca), May 14 2007
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EXTENSIONS
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Edited and a(5) to a(18) added by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 17 2007
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