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Search: id:A075655
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| A075655 |
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n + product of prime factors of n = (n+1) + product of prime factors of (n+1). |
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+0
1
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OFFSET
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1,1
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EXAMPLE
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24 + product of prime factors of 24 = 24 + 2 * 3 = 30; 25 + product of prime factors of 25 = 25 + 5 = 30; hence 24 belongs to the sequence.
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MATHEMATICA
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s[n_] := n + Apply[Times, Transpose[FactorInteger[n]][[1]]]; Select[Range[2, 10^5], s[ # ] == s[ # + 1] &]
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CROSSREFS
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Sequence in context: A002832 A109055 A056207 this_sequence A000856 A047678 A047938
Adjacent sequences: A075652 A075653 A075654 this_sequence A075656 A075657 A075658
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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 12 2002
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