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  1. Prove that 10101...10101 is NOT a prime. - Mathematics Stack …

    Feb 11, 2016 · So basically we have a number $10101...10101$ that contains $2016$ zeros and can be written as$ \sum _ { k=0 }^ { 2016 } { 100^ { k } }$ . I want to prove that this number is …

  2. Subtracting binary using two's complement - Mathematics Stack …

    The question is following subtraction, where the second term has to be transformed into it's two complement. 110000 - 10101 = twos complement of 10101 = 01011 This is the part where I'm …

  3. Does there exist prime number of the form $1010101010101.

    Oct 27, 2017 · I have checked numbers of the form $101010101...$ up to $1(01)_{2500}$ and the only prime I found is 101. I found that numbers of such form are quite rich in number of distinct …

  4. algebra precalculus - Conversion from binary fraction to octal ...

    Jan 28, 2012 · Can someone verify my results? Binary to Octal 1) 10101.11 is 25.75 2) 0.01101 is 0.6875 3) 10110110.001 is 266.125

  5. Why does every number of shape ababab is divisible by $13$?

    Jun 7, 2016 · 3 And not only that: Each such number is also divisible by the other primes 3, 7 and 37. Just factor the number 10101! Your specimen number is any 2-digit number $\times 10101\,$.

  6. No primes in this sequence - Mathematics Stack Exchange

    Nov 14, 2013 · Here's a fun little problem: Prove that the sequence $$10001, 100010001, 1000100010001, \\cdots$$ contains no prime numbers.

  7. Using binary arithmetic and computing for 'y'

    Jun 6, 2014 · Using binary arithmetic, a number y is computed by taking the n-bit two’s complement of x − c. If n is eleven, x = 101000010012 and c = 101012 then y =? How do we …

  8. Binary multiplication as combination of addition and left shift

    Aug 25, 2016 · Everything is binary, leftshift of $10101$ denoted as $l (10101) = 101010$, note that $10*x = l (x)$. The basic idea is that you split one of the numbers up and use the …

  9. discrete mathematics - Proving that if two integers have opposite ...

    Feb 21, 2018 · In math, parity is whether an integer is even or odd. In computing, parity is whether the number of 1 bits in the binary representation of the integer is even or odd. For example, in …

  10. Finding the largest prime in sequence 10101...

    Mar 9, 2017 · If you consider the (decimal) numbers 10, 101, 1010, 10101... where the 1 and 0 alternate, what is the largest prime number in the sequence? Thanks in advance for your help, …