A193415 - OEIS

A193415

Numbers from A193414 written in base 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

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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.

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 A333415 A264406

Adjacent sequences: A193412 A193413 A193414 * A193416 A193417 A193418

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Jul 25 2011

STATUS

approved