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A064841
Working in base 2, replace n with the concatenation of its prime divisors in increasing order.
3
1, 10, 11, 1010, 101, 1011, 111, 101010, 1111, 10101, 1011, 101011, 1101, 10111, 11101, 10101010, 10001, 101111, 10011, 1010101, 11111, 101011, 10111, 10101011, 101101, 101101, 111111, 1010111, 11101, 1011101, 11111, 1010101010, 111011
OFFSET
1,2
EXAMPLE
15 = 3*5 -> 11*101 -> 11101, so a(15) = 11101.
CROSSREFS
See A048985 for same terms written in base 10.
Sequence in context: A109280 A181756 A287874 * A286200 A286411 A288198
KEYWORD
nonn,easy,base
AUTHOR
N. J. A. Sloane, Oct 31 2001
EXTENSIONS
More terms from Larry Reeves (larryr(AT)acm.org) and Robert G. Wilson v, Nov 01 2001
STATUS
approved