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A094020
Least k <= n such that n*bigomega(k) = k*bigomega(n), where bigomega(n) = the number of prime divisors of n (counted with multiplicity) A001222.
2
1, 2, 3, 2, 5, 3, 7, 8, 9, 5, 11, 12, 13, 7, 15, 12, 17, 18, 19, 20, 21, 11, 23, 18, 25, 13, 27, 28, 29, 30, 31, 32, 33, 17, 35, 27, 37, 19, 39, 30, 41, 42, 43, 44, 45, 23, 47, 48, 49, 50, 51, 52, 53, 54, 55, 42, 57, 29, 59, 45, 61, 31, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73
OFFSET
1,2
LINKS
MATHEMATICA
lk[n_]:=Module[{k=1}, While[n PrimeOmega[k]!=k PrimeOmega[n], k++]; k]; Array[lk, 80] (* Harvey P. Dale, Jul 18 2024 *)
seq[lim_] := Module[{s = Table[PrimeOmega[n]/n, {n, 1, lim}], t = Table[0, {lim}]}, Do[t[[i]] = FirstPosition[s, s[[i]]][[1]], {i, 1, lim}]; t] ; seq[100] (* Amiram Eldar, Oct 05 2024 *)
CROSSREFS
Cf. A001222, A095305 for k such that a(k) < k.
Sequence in context: A336268 A075105 A265675 * A165609 A358462 A141465
KEYWORD
easy,nonn
AUTHOR
Jason Earls, May 31 2004
STATUS
approved