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Search: id:A064142
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| A064142 |
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Sum of all distinct primes dividing central binomial coefficient C(n,[n/2]). |
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+0
1
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| 0, 2, 3, 5, 7, 7, 12, 14, 12, 12, 23, 23, 29, 29, 32, 34, 48, 48, 62, 62, 61, 61, 81, 81, 73, 73, 69, 69, 98, 98, 127, 129, 123, 123, 130, 130, 148, 148, 161, 161, 195, 195, 227, 227, 204, 204, 251, 251, 253, 253, 257, 257, 307, 307, 323, 323, 316, 316, 367, 367
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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FORMULA
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a(n)=A008472[A001405(n)]
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PROGRAM
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(PARI) sopf(n)= { local(f, s=0); f=factor(n); for(i=1, matsize(f)[1], s+=f[i, 1]); return(s) } { for (n=1, 1000, write("b064142.txt", n, " ", sopf(binomial(n, n\2))) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 08 2009]
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CROSSREFS
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A008472, A001405.
Sequence in context: A039734 A020482 A060308 this_sequence A067792 A119317 A039248
Adjacent sequences: A064139 A064140 A064141 this_sequence A064143 A064144 A064145
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Sep 11 2001
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