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Search: id:A075881
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| A075881 |
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a(n) = the sum of the prime factors of Sum_{i=1,...,n} prime(i). |
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+0
1
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| 2, 5, 7, 17, 9, 41, 31, 18, 7, 46, 7, 197, 26, 281, 43, 130, 18, 170, 73, 74, 91, 120, 44, 110, 60, 46, 81, 460, 44, 62, 50, 620, 80, 712, 571, 812, 38, 108, 80, 10, 96, 386, 126, 1280, 74, 1412, 326, 138, 62, 67, 114, 26, 71, 2030, 3171, 71, 239, 230, 3711, 7699
(list; graph; listen)
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OFFSET
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0,1
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EXAMPLE
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The sum of the first three primes = 10 = 2 * 5, the prime factors of which sum to 7. Hence a(3) = 7.
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MATHEMATICA
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Table[Apply[Plus, Transpose[FactorInteger[Sum[Prime[k], {k, 1, i}]]][[1]]], {i, 1, 100}]
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CROSSREFS
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Sequence in context: A032045 A067580 A082088 this_sequence A089727 A113514 A145674
Adjacent sequences: A075878 A075879 A075880 this_sequence A075882 A075883 A075884
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KEYWORD
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nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Oct 16 2002
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