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A066673 Smallest term x from A066669 such that phi(x) = 2^n times some prime. 3
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, 8168859365, 12952273921 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..32.

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.

CROSSREFS

Cf. A000010, A066669-A066672.

Sequence in context: A001001 A067692 A117706 * A307762 A290947 A267985

Adjacent sequences:  A066670 A066671 A066672 * A066674 A066675 A066676

KEYWORD

nonn

AUTHOR

Labos Elemer, Dec 18 2001

EXTENSIONS

a(9)-a(30) from Donovan Johnson, May 23 2011

a(31)-a(32) from Donovan Johnson, May 26 2013

STATUS

approved

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Last modified April 1 01:38 EDT 2020. Contains 333153 sequences. (Running on oeis4.)