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A064804
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phi(2n+2) < phi(2n).
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1
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16, 22, 28, 34, 38, 40, 46, 52, 58, 64, 68, 76, 82, 86, 88, 94, 98, 100, 106, 112, 118, 124, 128, 130, 134, 136, 142, 148, 152, 154, 158, 160, 166, 172, 178, 184, 188, 190, 194, 196, 202, 206, 208, 214, 218, 220, 226, 232, 236, 238, 244, 248, 250, 256, 262, 268
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 2Select[ Range[200], EulerPhi[2# + 2] < EulerPhi[2# ] & ]
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) { n=e=0; forstep (m=2, 10^9, 2, f=eulerphi(m); if (f<e, write("b064804.txt", n++, " ", m - 2); if (n==1000, return)); e=f ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 26 2009]
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CROSSREFS
| Cf. A001837.
Sequence in context: A123662 A065778 A091118 * A102944 A058901 A059756
Adjacent sequences: A064801 A064802 A064803 * A064805 A064806 A064807
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KEYWORD
| easy,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 21 2001
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EXTENSIONS
| a(41) - a(56) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 26 2009
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