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Numbers k such that (prime(k) + composite(k)) == 0 (mod k)
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1fd328884f
modified: oeis-research/Jianing Song/Least coprime quadratic nonresidue to a(n)/sidef-sqrtmod.pl
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3 年之前 |
Numbers k such that sigma(k) = factorial of sum of digits of k
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6aed7a3c01
Update.
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3 年之前 |
Numbers k such that the decimal expansion of the k-th harmonic number starts with the digits of k
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9abfce7ac0
new file: oeis-research/Antti Karttunen/Numbers k such that derivative(sigma(k)) = k/search.sf
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3 年之前 |
Numbers m such that Sum_{k=1..m} omega(k) = sigma(m)
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bdfb549653
new file: oeis-research/Metin Sariyar/Numbers m such that Sum_{k=1..m} omega(k) = sigma(m)/inverse_sigma_smooth_search.pl
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2 年之前 |
Numbers n such that sum of first k composites k^k is prime
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4d085c9032
Remove commit history
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3 年之前 |
Start of the first run of n consecutive primes using only prime digits
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1377748865
new file: oeis-research/Metin Sariyar/Start of the first run of n consecutive primes using only prime digits/prog.pl
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3 年之前 |
Sum of first n prime powers of 2 + prime(n+1) is prime
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4d085c9032
Remove commit history
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3 年之前 |
Twin prime and prime-indices emirps
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4d085c9032
Remove commit history
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3 年之前 |