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A090334 Numbers with at least one divisor >1 that is a prefix of another divisor in binary representation. 3

%I #6 Dec 16 2021 07:38:02

%S 4,6,8,10,12,14,15,16,18,20,21,22,24,26,27,28,30,32,34,36,38,39,40,42,

%T 44,45,46,48,50,51,52,54,55,56,57,58,60,62,63,64,66,68,70,72,74,75,76,

%U 78,80,81,82,84,85,86,87,88,90,92,93,94,95,96,98,99,100,102,104,105

%N Numbers with at least one divisor >1 that is a prefix of another divisor in binary representation.

%C Complement of A090332.

%C Even numbers >2 belong to this sequence.

%F A090330(a(n)) > 0.

%F A090331(a(n)) > 1.

%e Divisors >1 of 51: {3,17,51}, in binary: {11, 10001, 110011}, as '11' is a prefix of '110011' 51 is a term.

%Y Cf. A090330, A090331.

%K nonn,base

%O 1,1

%A _Reinhard Zumkeller_, Nov 26 2003

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Last modified September 13 18:22 EDT 2024. Contains 375910 sequences. (Running on oeis4.)