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Least number such that the concatenation of all the previous terms with it is squarefree and has n prime factors
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57ec8c5a4b
new file: oeis-research/Daniel Suteu/Smallest number k > 0 such that bigomega(k^n + 1) = n/prog.sf
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6 months ago |
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Numbers k such that k divides sigma(k-2) + sigma(k-1) + sigma(k+1) + sigma(k+2)
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4d085c9032
Remove commit history
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3 years ago |
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Quasi-narcissistic numbers: k-digit numbers n whose sum of k-th powers of their digits is equal to n +- 1
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e1b57cd124
new file: oeis-research/Paolo P. Lava/Quasi-narcissistic numbers: k-digit numbers n whose sum of k-th powers of their digits is equal to n +- 1/prog.sf
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2 years ago |
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Smallest composite number with n distinct prime factors with property that the concatenation of its distinct prime factors, in descending order, is a palindrome
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4e90aa9a0b
Update.
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1 year ago |
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Squarefree difference of semiprimes
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4d085c9032
Remove commit history
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3 years ago |
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a(n) is the maximum prime factor of the concatenation of a(n-2) and a(n-1), with a(1)=1 and a(2)=2
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8fc34c482e
Update.
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2 years ago |
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a(n) is the maximum prime factor of the concatenation of all the previous terms, with a(1)=1, a(2)=2
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8fc34c482e
Update.
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2 years ago |
trizen
57ec8c5a4b
new file: oeis-research/Daniel Suteu/Smallest number k > 0 such that bigomega(k^n + 1) = n/prog.sf