A174417 - OEIS

A174417

Nonprimes that contain digits 0 and 1 only.

1, 10, 100, 110, 111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111, 10000, 10001, 10010, 10011, 10100, 10101, 10110, 11000, 11001, 11010, 11011, 11100, 11101, 11110, 11111, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 100111

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OFFSET

1,2

COMMENTS

a(n) = binary expansion of numbers A174416(n) (i.e. numbers whose binary expansion is a decimal nonprime).

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Sort[Flatten[Table[FromDigits/@(Join[{1}, #]&/@Tuples[{1, 0}, n]), {n, 0, 5}]]], !PrimeQ[#]&] (* Harvey P. Dale, Dec 26 2015 *)

CROSSREFS

Sequence in context: A248040 A034088 A169664 * A169666 A169662 A124252

Adjacent sequences: A174414 A174415 A174416 * A174418 A174419 A174420

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Mar 19 2010

EXTENSIONS

Keyword base added by Reinhard Zumkeller, Mar 31 2010

STATUS

approved