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Index of smallest prime p such that there is a gap of 2^n between p and next prime
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3 anni fa |
Largest prime divisor of n-th primorial + (n+1)-st prime
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2 anni fa |
Least k > 0 such that sigma(factorial(k)) >= n*factorial(k)
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3 anni fa |
Least k such that nextprime(k^n) - prevprime(k^n) = 4
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3 anni fa |
Number of different terms in the period of sqrt cfrac of repunits
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3 anni fa |
Number of nonsquarefree numbers not exceeding n
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7 mesi fa |
Number of powerful numbers between 2^(n-1)+1 and 2^n
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7 mesi fa |
Numbers k such that Cyclotomic(k,k) is prime
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3 anni fa |
Smallest x such that prime(x) mod composite(x) = n
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34bbd45cb3
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9 mesi fa |
a(n) = tau( sigma_n(n) ), where tau is the number of divisors of n
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532ff31203
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2 anni fa |