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Search: id:A060796
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| A060796 |
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Upper central divisor of n-th primorial. |
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+0
2
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| 2, 3, 6, 15, 55, 182, 715, 3135, 15015, 81345, 448630, 2733549, 17490603, 114388729, 785147363, 5708795638, 43850489690, 342503171205, 2803419704514, 23622001517543, 201817933409378, 1793779635410490, 16342166369958702
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OFFSET
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1,1
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FORMULA
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a(n)=A033677[A002110(n)]
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EXAMPLE
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n=8, q(8)=2.3.5.7.11.13.17.19=9699690. Its 64th and 65th divisors are {3094,3135}: a(8)=3135. and 3094<A000196(9699690)=3114<3135.
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MATHEMATICA
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k = 1; Do[k *= Prime[n]; l = Divisors[k]; x = Length[l]; Print[l[[x/2 + 1]]], {n, 1, 24}] (Propper)
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CROSSREFS
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A060755, A000196, A033677.
Cf. A060755, A000196, A033677.
Adjacent sequences: A060793 A060794 A060795 this_sequence A060797 A060798 A060799
Sequence in context: A088793 A121688 A082094 this_sequence A061059 A059842 A001529
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 27 2001
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EXTENSIONS
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More terms from Ryan Propper (rpropper(AT)stanford.edu), Jul 25 2005
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