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A051633 a(n) = 5*2^n - 2. 5
3, 8, 18, 38, 78, 158, 318, 638, 1278, 2558, 5118, 10238, 20478, 40958, 81918, 163838, 327678, 655358, 1310718, 2621438, 5242878, 10485758, 20971518, 41943038, 83886078, 167772158, 335544318, 671088638, 1342177278, 2684354558 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..29.

FORMULA

a(n) = A000079(n)*5 - 2 = A020714(n) - 2. - Omar E. Pol, Dec 23 2008

a(n) = 2*(a(n-1)+1) with a(0)=3. - Vincenzo Librandi, Aug 06 2010

a(n) = A123208(2*n+1) = A048487(n)+2 = A131051(n+2) = A153894(n)-1. - Philippe Deléham, Apr 15 2013

EXAMPLE

a(5) = 5*2^4 - 2 = 80 - 2 = 78.

a(1)=2*(3+1)=8; a(2)=2*(8+1)=18; a(3)=2*(18+1)=38. - Vincenzo Librandi, Aug 06 2010

MATHEMATICA

a=3; lst={a}; k=5; Do[a+=k; AppendTo[lst, a]; k+=k, {n, 0, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Dec 15 2008 *)

CROSSREFS

a(n) = A118654(n, 5).

Cf. A000079, A020714. - Omar E. Pol, Dec 23 2008

Sequence in context: A006478 A104187 * A131051 A172265 A258272 A117727

Adjacent sequences:  A051630 A051631 A051632 * A051634 A051635 A051636

KEYWORD

easy,nonn

AUTHOR

Asher Auel (asher.auel(AT)reed.edu)

STATUS

approved

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Last modified February 25 22:09 EST 2018. Contains 299660 sequences. (Running on oeis4.)