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Search: id:A053038
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| A053038 |
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The first (largest) power of 2 arising in the iteration-sequence when A051593(cototient function) is repeatedly applied starting with n!. |
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4
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| 1, 2, 4, 16, 32, 128, 512, 4096, 16384, 2048, 8192, 65536, 16384, 65536, 8388608, 134217728, 8388608, 8388608, 16777216, 2097152, 8388608, 268435456, 4398046511104, 70368744177664, 67108864, 67108864, 67108864, 68719476736
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OFFSET
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1,2
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EXAMPLE
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n=10, initial value=10!=3628800; after the following initial terms {3628800,2799360,2052864,1430784,974592,656640,490752,329472, 237312,158976,108288,72960,54528,36608,21248,10752,7680,5632,3072...} the first power of 2 is 2048=cototient(3072). Therefore a(10)=2048.
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CROSSREFS
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A051593, A053475, A053039.
Sequence in context: A032464 A081411 A094384 this_sequence A001088 A101926 A087965
Adjacent sequences: A053035 A053036 A053037 this_sequence A053039 A053040 A053041
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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), Feb 24 2000
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