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A053146
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When cototient function (A051953) is iterated with initial value A002110(n), a(n) = number of iterates that are not powers of 2.
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0
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1, 2, 4, 6, 12, 11, 25, 22, 32, 26, 54, 55, 67, 68, 85, 117, 126, 113, 150, 166, 130, 178, 186, 207, 201, 194, 253, 255, 256, 295, 284, 309, 320, 315, 348, 347, 365, 398, 423, 425, 433, 459, 468, 488
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| In these iteration chains the number of non-2-powers seem to be in majority.
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EXAMPLE
| n=6, A002110(6)=30030; the corresponding iteration chain is: {30030,24270,17806,9238,4798,2400,1760,1120,736,384,256,128,64,32,16,8,4,2,1,0}. It has 20 terms, among which entries from the first to 10th, also the last 0, are not powers of 2, so a(6)=11.
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CROSSREFS
| A002110, A051953.
Sequence in context: A057700 A136103 A180304 * A056675 A062857 A061799
Adjacent sequences: A053143 A053144 A053145 * A053147 A053148 A053149
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KEYWORD
| more,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Feb 28 2000
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EXTENSIONS
| a(13)-a(44) from Donovan Johnson (donovan.johnson(AT)yahoo.com), May 13 2010
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