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15
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Number-finding puzzle

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#decimal-expansion
364
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Conjecture about the digits of $\pi$

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#probability-theory #pi #decimal-expansion #turing-machines
72
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Decimal expansion of rational number

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#rational-numbers #decimal-expansion #number-systems
129
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A four digit number reversed

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#contest-math #decimal-expansion
115
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Which number has more digits and by how many?

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#puzzle #decimal-expansion
554
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What are the trailing number of the zeroes in the given integer

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#elementary-number-theory #summation #factorial #decimal-expansion
1.5k
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How many prime numbers between 1000-10000 (inclusive) that if you take the sum of their digits, that number is divisible by 8?

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#elementary-number-theory #prime-numbers #decimal-expansion
3.3k
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Finding digits of large exponent

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#logarithms #exponentiation #decimal-expansion
87
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Number of natural numbers below $10^4$ with digits sum $7$

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#combinatorics #number-theory #decimal-expansion
86
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Are arithmetic operations are only defined to base $10$?

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#arithmetic #decimal-expansion
56
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A question involving decimal expansions

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#number-theory #decimal-expansion #fractal-analysis
138
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Prove or disprove that there is an infinite number of even numbers in the decimal expansion of $\sqrt2$.

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#number-theory #irrational-numbers #decimal-expansion
199
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How many positive integers less than a million have either a 2 or a 4 (but not both) in its digits?

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#combinatorics #decimal-expansion
135
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If we delete the non-primes from $e$, is the resulting number transcendental?

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#number-theory #decimal-expansion #transcendental-numbers
361
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If $999\times \mathrm{abc}=\mathrm{def123}$ in decimal system, then find $\mathrm{a,b,c,d,e\ and\ f}.$

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#algebra-precalculus #elementary-number-theory #decimal-expansion

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