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15
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Irrationality of the concatenation of decimal expansions of primes

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#elementary-number-theory #prime-numbers #decimal-expansion #rationality-testing
142
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Prepend a 9 or append a 0?

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#elementary-number-theory #decimal-expansion
500
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Real numbers as decimals

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#reference-request #education #decimal-expansion
11.9k
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How many even 3 digit numbers contain at least one 7.

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#combinatorics #decimal-expansion
4.4k
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Why do divisions like 1/98 and 1/998 give us numbers continuously being multiplied by two each time in decimal form?

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#decimal-expansion
308
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How to round percents

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#decimal-expansion
67
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Given $x,y\in\mathbb R$ is there a "formulaic" way to obtain a $q\in\mathbb Q$ with $a<q<b?$

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#real-analysis #computer-science #first-order-logic #real-numbers #decimal-expansion
81
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$Pi(n) = Pi(n-2) + x\times [Pi(n-1)]$ for all convergent numerators and denominators. True?

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#decimal-expansion #exact-sequence #algorithmic-randomness
27
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Having problems understanding this algebraic expression

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#decimal-expansion
19.3k
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How many digits are there in 100!?

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#factorial #decimal-expansion
1k
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Prove that a square of a positive integer cannot end with $4$ same digits different from $0$

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#elementary-number-theory #modular-arithmetic #decimal-expansion #square-numbers
766
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Does my "Prime Factor Look-and-Say" sequence always end?

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#sequences-and-series #recreational-mathematics #decimal-expansion
113
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Prove: for all $n$ there's a $m$ such that the sum of digits in $mn$ is equal to $n$.

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#elementary-number-theory #decimal-expansion
250
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Prove a > 0 is a terminating decimal if and only if it has more than one decimal representation

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#proof-writing #decimal-expansion
219
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Left most Digits of $5^n$

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#number-theory #exponentiation #decimal-expansion #diophantine-approximation

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