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A133472
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6 followed by numbers with n-1 0's between 1 and 5.
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1
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6, 15, 105, 1005, 10005, 100005, 1000005, 10000005, 100000005, 1000000005, 10000000005, 100000000005, 1000000000005, 10000000000005, 100000000000005, 1000000000000005, 10000000000000005, 100000000000000005
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..500
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FORMULA
| O.g.f.: -3*(-2+17*x)/((-1+x)*(-1+10*x)) = -5/(-1+x)-1/(-1+10*x) . a(n)=10*a(n-1)-45. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 30 2007
a(n)=10^(n-1)+5, with n>=1 - Paolo P. Lava (paoloplava(AT)gmail.com), Dec 19 2007
a(n) = 10^n+5; [From Vincenzo Librandi, Aug 10 2011]
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PROG
| (MAGMA) [10^n+5: n in [0..20]]; // Vincenzo Librandi, Aug 10 2011
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CROSSREFS
| Cf. A068128, A133384.
Sequence in context: A068128 A013222 A013228 * A087137 A056317 A129421
Adjacent sequences: A133469 A133470 A133471 * A133473 A133474 A133475
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Nov 29 2007
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