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Find all 3-digit numbers divisible by a sum of groups of its digits

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#combinatorics #divisibility #decimal-expansion
94
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Closed Form Addition of BCD numbers

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#logic #arithmetic #binary #decimal-expansion
76
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Mathematical representation of each digit?

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#decimal-expansion
1.7k
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Can the product of two rational numbers be an irrational number? (Kindly see the example in description)

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#irrational-numbers #rational-numbers #decimal-expansion
317
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Every real number has a decimal representation.

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#real-numbers #decimal-expansion
268
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Find $21^{1234}\pmod{100}\equiv \ ?$

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#elementary-number-theory #modular-arithmetic #decimal-expansion
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How can $\frac{4}{3} \times 3=4$ if $ \frac{4}{3}$ is $1.3$?

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#algebra-precalculus #fractions #decimal-expansion #calculator
244
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Continuity of the reals in terms of decimal expansions

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#real-numbers #decimal-expansion
103
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Can we prove that infinite many primes begin with any given digitstring?

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#elementary-number-theory #prime-numbers #decimal-expansion #prime-gaps
641
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Why 0.33... is the only expression of 1/3?

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#algebra-precalculus #recreational-mathematics #decimal-expansion
1.2k
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Sum of digits of $a^b$ equals $ab$

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#number-theory #decimal-expansion #conjectures
24
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Translating binary plaintext into alphabetic plaintext using an $18$-digit base-$26$ integer system

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#cryptography #decimal-expansion
84
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Show that decimal addition on real numbers is well defined

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#calculus #analysis #vector-analysis #decimal-expansion
2.7k
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Digits in product of two numbers

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#number-theory #elementary-number-theory #decimal-expansion
2.6k
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Primes with digits only 1

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#number-theory #prime-numbers #decimal-expansion #repunit-numbers

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