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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 (list; graph; refs; listen; history; text; internal format)
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 0 digits. Sequence is infinite.

LINKS

Table of n, a(n) for n=1..35.

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 A264406 A057148

Adjacent sequences:  A193412 A193413 A193414 * A193416 A193417 A193418

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Jul 25 2011

STATUS

approved

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Last modified September 18 12:38 EDT 2019. Contains 327170 sequences. (Running on oeis4.)