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 A362910 Semiprimes p*q for which p <= q < p^3. 0
 4, 6, 9, 10, 14, 15, 21, 25, 33, 35, 39, 49, 51, 55, 57, 65, 69, 77, 85, 91, 95, 115, 119, 121, 133, 143, 145, 155, 161, 169, 185, 187, 203, 205, 209, 215, 217, 221, 235, 247, 253, 259, 265, 287, 289, 295, 299, 301, 305, 319, 323, 329, 335, 341, 355, 361, 365 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The terms have already been considered as "strongly semiprimes". LINKS Table of n, a(n) for n=1..57. Sh. T. Ishmukhametov and F. F. Sharifullina, On distribution of semiprime numbers, Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika, 2014, No. 8, pp. 53-59. English translation, Russian Mathematics, Vol. 58, No. 8 (2014), pp. 43-48, alternative link. FORMULA Limit_{n->oo} n*log(a(n))/a(n) = log(3). MAPLE with(numtheory): q:= n-> bigomega(n)=2 and (s-> max(s)2, 0, my(minfact=factor(n)[1, 1], maxfact=n/minfact); maxfact

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Last modified February 26 12:26 EST 2024. Contains 370352 sequences. (Running on oeis4.)