The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A141495 a(n) = 3*a(n-1) for n>2; a(0)=1, a(1)=3, a(2)=7. 3
 1, 3, 7, 21, 63, 189, 567, 1701, 5103, 15309, 45927, 137781, 413343, 1240029, 3720087, 11160261, 33480783, 100442349, 301327047, 903981141, 2711943423, 8135830269, 24407490807, 73222472421, 219667417263, 659002251789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS A sequence of the form: a(0)=1, a(1)=prime(m), a(2)=prime(m+2), a(n)=a(1)*a(n-1). a(n) is divisible by 7 for n>1. - Colin Barker, Jan 09 2014 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (3). FORMULA a(n) = A082541(n-1), n>1. - R. J. Mathar, Aug 27 2008 a(n) = 7*3^(n-2) for n>1. a(n)=3*a(n-1) for n>2. G.f.: (2*x^2-1) / (3*x-1). - Colin Barker, Jan 09 2014 MATHEMATICA a[0] = 1; a[1] = 3; a[2] = 7; a[n_] := a[n] = a[1]*a[n - 1]; Table[a[n], {n, 0, 30}] CROSSREFS Cf. A084215. For other examples see A141496, etc. Sequence in context: A148671 A148672 A148673 * A151412 A121797 A109361 Adjacent sequences:  A141492 A141493 A141494 * A141496 A141497 A141498 KEYWORD nonn,easy AUTHOR Roger L. Bagula, Aug 10 2008 EXTENSIONS Edited by N. J. A. Sloane, Aug 16 2008 STATUS approved

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

Last modified September 28 04:37 EDT 2020. Contains 337392 sequences. (Running on oeis4.)