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Highly composite numbers - twin primes
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4d085c9032
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il y a 3 ans |
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Indices of Tribonacci primes
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4d085c9032
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il y a 3 ans |
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Largest prime factor of A001008(n), numerator of n-th harmonic number
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8fc34c482e
Update.
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il y a 2 ans |
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Least odd primitive abundant number with n prime factors, counted with multiplicity
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64979be6a4
new file: oeis-research/J.W.L. (Jan) Eerland/Least prime p such that p^n + 6 is the product of n distinct primes/is_squarefree_almost_prime.sf
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il y a 4 mois |
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Numbers k such that Omega(k) = Omega(2^k-1), where Omega(k) is the number of prime factors of k counted with multiplicity (A001222)
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7935360128
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il y a 1 an |
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Numbers of the form N = a+b+c such that N^3 = concat(a,b,c)
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7fba720525
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il y a 1 an |
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Sum of sigma(n) mod k for k = 1..n-1
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47a7397f2c
new file: oeis-research/Joseph Biberstine/Sum of remainders of the n-th prime mod k, for k = 1..n/prog.sf
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il y a 3 ans |
trizen
64979be6a4
new file: oeis-research/J.W.L. (Jan) Eerland/Least prime p such that p^n + 6 is the product of n distinct primes/is_squarefree_almost_prime.sf