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Search: id:A119603
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| A119603 |
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Merging prime factors of n-th composite number. |
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+0
1
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| 22, 23, 222, 33, 25, 223, 27, 35, 2222, 233, 225, 37, 211, 2223, 55, 213, 333, 227, 235, 22222, 311, 217, 57, 2233, 219, 313, 2225, 237, 2211, 335, 223, 22223, 77, 255, 317, 2213, 2333, 511, 2227, 319, 229, 2235, 231, 337, 222222, 513, 2311, 2217, 323, 257
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Rule "replace n-th composite number by concatenation of its prime factors" in A037271; composite numbers A002808.
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EXAMPLE
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a(6)=223 because 6th composite number is
12: A002808(6)=12, then 12=2*2*3 and merging prime
factors we get a(6)=223.
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MATHEMATICA
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Sow[FromDigits@Flatten[Table[IntegerDigits[ #[[1]]], {#[[2]]}]&/@FactorInteger@(n)]]], {n, 2, 115}]][[2, 1]]
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CROSSREFS
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Cf. A002808, A037271.
Sequence in context: A041998 A042000 A042002 this_sequence A042004 A042006 A042008
Adjacent sequences: A119600 A119601 A119602 this_sequence A119604 A119605 A119606
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov, Jun 03 2006
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