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 A336848 a(n) = A003973(n) / A336846(n). 9
 1, 2, 3, 13, 4, 2, 6, 10, 31, 8, 7, 13, 9, 4, 12, 121, 10, 62, 12, 52, 18, 14, 15, 2, 19, 6, 39, 26, 16, 8, 19, 182, 21, 20, 24, 403, 21, 8, 27, 40, 22, 12, 24, 7, 124, 10, 27, 121, 133, 38, 6, 13, 30, 26, 4, 20, 36, 32, 31, 52, 34, 38, 62, 1093, 36, 14, 36, 130, 9, 16, 37, 62, 40, 14, 57, 52, 42, 18, 42, 484, 781 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS If there are no more 1's in this sequence after the initial one, then there are no odd terms of A001599 (Ore's Harmonic Numbers) larger than one. LINKS Antti Karttunen, Table of n, a(n) for n = 1..16383 Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537 Index entries for sequences computed from indices in prime factorization Index entries for sequences related to sigma(n) FORMULA a(n) = A003973(n) / A336846(n). PROG (PARI) A003961(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); }; A336848(n) = { my(u=A003961(n), s=sigma(u)); (s/gcd(s, numdiv(n)*u)); }; CROSSREFS Cf. A000005, A000203, A001599, A003961, A003973, A336845, A336846, A336847, A336849. Sequence in context: A362289 A345040 A196378 * A336838 A051298 A069870 Adjacent sequences: A336845 A336846 A336847 * A336849 A336850 A336851 KEYWORD nonn AUTHOR Antti Karttunen, Aug 06 2020 STATUS approved

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Last modified September 19 09:30 EDT 2024. Contains 376007 sequences. (Running on oeis4.)