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A066671
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Powers of 2 arising in A066669: a(n) is the largest even divisor of EulerPhi[A066669(n)], which is by definition is a power of 2.
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1
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2, 2, 2, 4, 2, 2, 4, 2, 2, 4, 4, 4, 4, 4, 8, 4, 8, 8, 4, 4, 8, 2, 2, 4, 8, 4, 8, 8, 4, 2, 16, 4, 4, 8, 8, 8, 8, 8, 2, 8, 8, 8, 8, 8, 4, 2, 32, 8, 16, 16, 4, 2, 8, 16, 16, 8, 8, 2, 32, 16, 16, 8, 8, 4, 16, 4, 16, 16, 4, 8, 32, 16, 8, 16, 16, 2, 2, 16, 4, 8, 16, 4, 8, 2, 16, 8, 32, 4, 64, 32, 32
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| First, 4th and 15th terms in A066669 are 7, 13, 35; Phi[7] = 2.3, Phi[13] = 4.3, Phi[35] = 24 = 8.3; the largest even divisors[powers of 2] are 2, 4, 8; so a(1) = 2, a(4) = 4, a(15) = 8.
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CROSSREFS
| Cf. A000010, A066669-A066673, A065966.
Sequence in context: A160691 A049716 A188903 * A159802 A049627 A134058
Adjacent sequences: A066668 A066669 A066670 * A066672 A066673 A066674
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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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