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Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions

3 votes
1 answer
508 views

Sequences satisfying gcd(S(x), S(y)) = S(gcd(x,y))

Consider the sequence S(x) = 2^x - 1. This sequence has two interesting properties: a) If the GCD of S(x) and S(y) is S(gcd(x,y)), and b) For any prime p, S(p-1) is divisible by p. Property a follo …
yrudoy's user avatar
  • 435
0 votes
1 answer
830 views

Numbers whose powers approach integers [closed]

Let d(x) denote the distance from x to the nearest integer. Are there any non-integral numbers X for which the sequence d(X), d(X^2), d(X^3), etc. converges to 0? EDIT: Sorry, I forgot to exclude th …
yrudoy's user avatar
  • 435
22 votes
2 answers
2k views

Have all numbers with "sufficiently many zeros" been proven transcendental?

Any number less than 1 can be expressed in base g as $\sum _{k=1}^\infty {\frac {D_k}{g^k}}$, where $D_k$ is the value of the $k^{th}$ digit. If we were interested in only the non-zero digits of this …
yrudoy's user avatar
  • 435