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A121349 a(n) = round(Pi*2^(n-1)). 2
1, 3, 6, 13, 25, 50, 101, 201, 402, 804, 1608, 3217, 6434, 12868, 25736, 51472, 102944, 205887, 411775, 823550, 1647099, 3294199, 6588397, 13176795, 26353589, 52707179, 105414357, 210828714, 421657428, 843314857, 1686629713, 3373259426 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

As n approaches infinity, the distance between the center and each vertex of a regular polygon with a(n) sides of unit length approaches 2^(n-2) units. - Ahmad J. Masad, Jul 02 2021

LINKS

Table of n, a(n) for n=0..31.

MATHEMATICA

Table[FromDigits[RealDigits[Pi, 2, k][[1]], 2], {k, 1, 50}]

PROG

(PARI) a(n) = round(Pi*2^(n-1)); \\ Michel Marcus, Jul 02 2021

CROSSREFS

Cf. A004601, A068425.

Sequence in context: A005406 A005407 A005116 * A215984 A074890 A244704

Adjacent sequences:  A121346 A121347 A121348 * A121350 A121351 A121352

KEYWORD

easy,nonn,changed

AUTHOR

Carlos Alves, Jul 22 2006

EXTENSIONS

Better definition from Jon E. Schoenfield, Jan 17 2015

STATUS

approved

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Last modified July 27 21:21 EDT 2021. Contains 346316 sequences. (Running on oeis4.)