OFFSET
1,2
COMMENTS
To generate A003460 as a binary sequence: Start with a(1)=1. To construct a(n) from a(n-1), concatenate a(n-1), 1, b(n-1) where b(n-1) is the same as a(n-1) except that the middle bit of a(n-1) is flipped. The actual sequence lists a(n) in octal rather than binary. Thus, starting with a(1) = 1, we form a(2) = (1)(1)(0) (which is 6 in octal). Next, a(2) = (110)(1)(100) (which is 154 in octal), and so on. - Sean A. Irvine, May 21 2015
REFERENCES
M. Gardner, Mathematical Games, Sci. Amer. Vol. 216 (No. 4, Apr. 1967), p. 118.
M. Gardner, Mathematical Magic Show. Random House, NY, 1978, p. 216.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..11
D. J. Andrews, Letters to N. J. A. Sloane, 1974, with enclosures from Martin Gardner's column.
Eric Weisstein's World of Mathematics, Dragon Curve.
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved