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Search: id:A113866
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| 2, 7, 71, 73, 811, 821, 823, 883, 937, 947, 953, 977, 983, 997, 1031, 1033, 1051, 1063, 1093, 1103, 1153, 1171, 1181, 1193, 1231, 1277, 1279, 1289, 1291, 1297, 1303, 1321, 1381, 1427, 1429, 1439, 1451, 1453, 1471, 1481, 1483, 29599, 29641, 29683, 29717
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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if the sequence of iterates hits an odd square, then the succeeding f(n) is even. The iterates will remain even until f(n) is an even square, so the sequence grows slowly for a long time, then has big 'jumps' . Is the sequence infinite ?
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EXAMPLE
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If f(n) = n + tau(n), then the functional iterates of 7 are 7,9,12,18,24,32,38,42,50,56,64, and 71 which is prime so a(2)=7, a(3)=71
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CROSSREFS
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Cf. A064491.
Sequence in context: A133237 A099660 A094223 this_sequence A106917 A061421 A100360
Adjacent sequences: A113863 A113864 A113865 this_sequence A113867 A113868 A113869
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KEYWORD
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nonn
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AUTHOR
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John L. Drost (drost(AT)marshall.edu), Jan 25 2006
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