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A066673
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Smallest term x from A066669 such that phi(x) = 2^n times some prime.
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3
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7, 13, 35, 65, 97, 193, 485, 769, 1649, 3281, 8245, 12289, 24929, 49601, 124645, 197633, 423793, 786433, 2118965, 3158273, 6357089, 12648641, 31785445, 50397953, 108070513, 202113281, 540352565, 805384193, 1633771873, 3221225473
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| Phi of {7, 13, 35, 65, 97, 193, 485, 769} is {6, 12, 24, 48, 96, 192, 384, 768}, of which {2, 4, 8, 16, 32, 64, 128, 256} are the largest even factors.
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CROSSREFS
| Cf. A000010, A066669-A066672.
Sequence in context: A001001 A067692 A117706 * A173230 A155036 A088985
Adjacent sequences: A066670 A066671 A066672 * A066674 A066675 A066676
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Dec 18 2001
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EXTENSIONS
| a(9)-a(30) from Donovan Johnson (donovan.johnson(AT)yahoo.com), May 23 2011
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