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A108906 First differences of A006899. 6
1, 1, 1, 4, 1, 7, 11, 5, 32, 17, 47, 115, 13, 256, 217, 295, 1024, 139, 1909, 2465, 1631, 8192, 3299, 13085, 26281, 6487, 65536, 46075, 84997, 262144, 7153, 517135, 545747, 502829, 2097152, 588665, 3605639, 5960299, 2428309, 16777216, 9492289 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

In the 14th century Levi Ben Gerson proved that this sequence contains only four 1s; see A235365, A235366, A236210. - Jonathan Sondow, Jan 20 2014

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

MAPLE

A:={seq(2^n, n=0..63)}: B:={seq(3^n, n=0..40)}: C:=sort(convert(A union B, list)): seq(C[j]-C[j-1], j=2..44); # Emeric Deutsch, Aug 03 2005

MATHEMATICA

nn = 10^20; t = Union[ 2^Range[0, Floor[Log[2, nn]]], 3^Range[0, Floor[Log[3, nn]]]]; Differences@ t (* Robert G. Wilson v, May 26 2014 *)

PROG

(Haskell)

a108906 n = a108906_list !! (n-1)

a108906_list = zipWith (-) (tail a006899_list) a006899_list

-- Reinhard Zumkeller, Oct 09 2013

CROSSREFS

Cf. A006899.

Cf. also A235365, A235366, A236210.

Sequence in context: A078975 A050411 A010643 * A193842 A134250 A139045

Adjacent sequences:  A108903 A108904 A108905 * A108907 A108908 A108909

KEYWORD

easy,nonn

AUTHOR

Ali A. Tanara (tanara(AT)khayam.ut.ac.ir), Jul 17 2005

EXTENSIONS

More terms from Emeric Deutsch, Aug 03 2005

STATUS

approved

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Last modified January 26 16:58 EST 2020. Contains 331280 sequences. (Running on oeis4.)