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Search: id:A080670
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| A080670 |
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Literal reading of the prime factorization of n. |
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+0
4
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| 1, 2, 3, 22, 5, 23, 7, 23, 32, 25, 11, 223, 13, 27, 35, 24, 17, 232, 19, 225, 37, 211, 23, 233, 52, 213, 33, 227, 29, 235, 31, 25, 311, 217, 57, 2232, 37, 219, 313, 235, 41, 237, 43, 2211, 325, 223, 47, 243, 72, 252, 317, 2213, 53, 233, 511, 237, 319, 229, 59, 2235
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Exponents equal to 1 are omitted and therefore A080670 differs from A067599.
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EXAMPLE
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8=2^3, which reads 23, hence a(8)=23; 12=2^2.3, which reads 223, hence a(12)=223
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MATHEMATICA
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f[n_] := Block[{p = Flatten[ FactorInteger[n]]}, k = Length[p]; While[k > 0, If[ p[[k]] == 1, p = Delete[p, k]]; k-- ]; FromDigits[ Flatten[ IntegerDigits[p]]]]; Table[ f[n], {n, 2, 60}]
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CROSSREFS
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Cf. A037276, A067599.
Sequence in context: A090122 A114749 A141458 this_sequence A073647 A073646 A109671
Adjacent sequences: A080667 A080668 A080669 this_sequence A080671 A080672 A080673
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KEYWORD
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nonn,base
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Mar 02 2003
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 02 2003
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