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A193415
Numbers from A193414 written in base 2.
2
1, 11, 101, 111, 1001, 1011, 1101, 1111, 10001, 10011, 10111, 11001, 11011, 11101, 11111, 100001, 100011, 100111, 101111, 110001, 110011, 110111, 111001, 111011, 111101, 111111, 1000001, 1000011, 1000111, 1001111, 1011111, 1100001, 1100011, 1100111, 1101111
OFFSET
1,2
COMMENTS
For n > 1 the structure of digits represents a valley. The first digit is equal to the last digit (1). The first digits are in nonincreasing order. The last digits are in nondecreasing order. The numbers may have more than one 0 digit. Sequence is infinite.
EXAMPLE
Illustration using 67 = 1000011_2:
1 . . . . 1 1
. 0 0 0 0 . .
CROSSREFS
Cf. A193413 (Valley numbers written in base 10).
Sequence in context: A265510 A265528 A099821 * A263609 A333415 A264406
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Jul 25 2011
STATUS
approved