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A003138 Nearest integer to 24(2^n-1)/n. 4
24, 36, 56, 90, 149, 252, 435, 765, 1363, 2455, 4466, 8190, 15122, 28085, 52427, 98303, 185041, 349524, 662257, 1258290, 2396744, 4575603, 8753329, 16777215, 32212254, 61946643, 119304646, 230087533 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

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]

Z. Sunic, Tree morphisms, transducers and integer sequences

CROSSREFS

Cf. A003176, A003177, A121056.

Sequence in context: A124283 A143645 A003176 * A003177 A038530 A262428

Adjacent sequences:  A003135 A003136 A003137 * A003139 A003140 A003141

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 18 07:50 EDT 2019. Contains 327168 sequences. (Running on oeis4.)