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Search: id:A147551
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| A147551 |
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a(n) is the minimum of the numbers phi(m) where m is an n-digit number. |
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+0
2
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| 1, 4, 32, 240, 2304, 20736, 184320, 1843200, 17740800, 170311680, 1642291200, 16057958400, 153280512000, 1532805120000, 15229951672320, 147149291520000, 1456777986048000, 14214621560832000, 140724753452236800
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OFFSET
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1,2
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COMMENT
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For all natural numbers n, A147551(n)=phi(A147550(n)).
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LINKS
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H. v. Eitzen, Table of n, a(n) for n=1..31
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MATHEMATICA
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a[n_]:=Min[EulerPhi[Range[10^(n-1), 10^n-1]]]; Do[Print[a[n]], {n, 10}]
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CROSSREFS
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Cf. A147550.
Sequence in context: A099269 A125823 A033515 this_sequence A007278 A108449 A013731
Adjacent sequences: A147548 A147549 A147550 this_sequence A147552 A147553 A147554
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KEYWORD
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base,nonn
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Nov 23 2008
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EXTENSIONS
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More terms from Hagen von Eitzen (math(AT)von-eitzen.de), Jun 05 2009
Offsets in b-file corrected by N. J. A. Sloane, Aug 31 2009
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