A158581 - OEIS

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A158581

Numbers having in binary representation at least two ones and two zeros.

4

9, 10, 12, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 50, 51, 52, 53, 54, 56, 57, 58, 60, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 96, 97

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

A023416(a(n)) > 1; A000120(a(n)) > 1.

MATHEMATICA

Select[Range[100], Min[DigitCount[#, 2]]>1&] (* Harvey P. Dale, Mar 09 2013 *)

PROG

(Python)

def ok(n): b = bin(n)[2:]; return b.count('0') >= 2 and b.count('1') >= 2

print(list(filter(ok, range(98)))) # Michael S. Branicky, Sep 10 2021

CROSSREFS

Intersection of A158582 and A057716.

Cf. A007088, A000120, A023416

Sequence in context: A190665 A242475 A160947 * A343258 A078459 A156345

Adjacent sequences: A158578 A158579 A158580 * A158582 A158583 A158584

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Apr 16 2009

STATUS

approved