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 A174416 Numbers whose binary expansion is a decimal nonprime. 2
 1, 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Complement of A036952. Binary expansion of a(n) in A174417. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE For n=6, a(6) = 8; binary expansion of 8 = 1000 (nonprime). MAPLE remove(t -> isprime(convert(t, binary)), [\$1..100]); # Robert Israel, Jun 13 2017 MATHEMATICA Select[Range[80], !PrimeQ[FromDigits[IntegerDigits[#, 2]]]&] (* Harvey P. Dale, May 10 2012 *) CROSSREFS Sequence in context: A023835 A272633 A240817 * A228728 A138888 A039240 Adjacent sequences: A174413 A174414 A174415 * A174417 A174418 A174419 KEYWORD nonn AUTHOR Jaroslav Krizek, Mar 19 2010 EXTENSIONS Corrected and extended by Harvey P. Dale, May 10 2012 STATUS approved

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Last modified August 7 10:36 EDT 2024. Contains 375011 sequences. (Running on oeis4.)