The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A177019 a(n) = 3*10^(2*n) + 3*10^n + 1. 2
 7, 331, 30301, 3003001, 300030001, 30000300001, 3000003000001, 300000030000001, 30000000300000001, 3000000003000000001, 300000000030000000001, 30000000000300000000001, 3000000000003000000000001, 300000000000030000000000001, 30000000000000300000000000001, 3000000000000003000000000000001 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..100 Index entries for linear recurrences with constant coefficients, signature (111,-1110,1000). FORMULA G.f.: (7-446*x+1330*x^2)/((1-x)*(1-10*x)*(1-100*x)). - Vincenzo Librandi, Aug 19 2014 E.g.f.: exp(x)*(1 + 3*exp(9*x) + 3*exp(99*x)). - Stefano Spezia, Aug 05 2024 EXAMPLE For n=0, a(0)=7; n=1, a(1)=3*10^2+3*10+1=331. MATHEMATICA CoefficientList[Series[(7 - 446 x + 1330 x^2)/((1 - x)(1 - 10 x) (1 - 100 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Aug 19 2014 *) PROG (Magma) [(3*10^(2*n)+3*10^n+1): n in [0..15]]; CROSSREFS Cf. A011557, A098608. Sequence in context: A374418 A092588 A049686 * A160432 A324233 A009587 Adjacent sequences: A177016 A177017 A177018 * A177020 A177021 A177022 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, May 24 2010 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 13 03:07 EDT 2024. Contains 375857 sequences. (Running on oeis4.)