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Search: id:A065761
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A065761 Concatenation of increasing number of alternating digits in base 2, starting with 0. +0
3
0, 3, 24, 399, 12768, 817215, 104603520, 26778501375, 13710592704000, 14039646928897023, 28753196910381103104, 117773094544920998318079, 964797190511992818221703168, 15807237169348490333744384720895 (list; graph; listen)
OFFSET

1,2

COMMENT

The first 5 terms in base 2 are 0, (0)11, (0)11000, (0)110001111, (0)11000111100000.

FORMULA

a(1) = 0; a(n+1) = append n+1 0's or 1's (alternately) to a(n).

EXAMPLE

a(5) = 12768 is formed by appending 0 five times (00000) to a(4) in base 2: (0)11000111100000.

CROSSREFS

Cf. A065760, A065447.

Sequence in context: A003236 A082166 A010791 this_sequence A002832 A109055 A056207

Adjacent sequences: A065758 A065759 A065760 this_sequence A065762 A065763 A065764

KEYWORD

base,easy,nonn

AUTHOR

Lior Manor (lior.manor(AT)gmail.com) Nov 18 2001

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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