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A003176 Integer part of 24(2^n-1)/n. 4
24, 36, 56, 90, 148, 252, 435, 765, 1362, 2455, 4466, 8190, 15121, 28085, 52427, 98302, 185041, 349524, 662257, 1258290, 2396744, 4575603, 8753329, 16777215, 32212253, 61946642, 119304646, 230087532 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..300

R. J. Penrose, Puzzle, Twistor Newsletter, No. 10 (July 1980), p. 22.

R. J. Penrose, Puzzle, Twistor Newsletter, No. 10 (July 1980), p. 22. [Cached copy]

R. J. Penrose, Solution to puzzle, Twistor Newsletter, No. 41, p. 37, 1996.

R. J. Penrose, Solution to puzzle, Twistor Newsletter, No. 41, p. 37, 1996. [Cached copy]

MATHEMATICA

a[n_] := Floor[24*(2^n-1)/n]; Array[a, 30] (* Giovanni Resta, Mar 25 2017 *)

PROG

(MAGMA) [Floor(24*(2^n-1)/n): n in [1..45]]; // Vincenzo Librandi, May 08 2011

CROSSREFS

Cf. A000799, A003138, A003177, A121056.

Sequence in context: A165602 A124283 A143645 * A003138 A003177 A038530

Adjacent sequences:  A003173 A003174 A003175 * A003177 A003178 A003179

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)