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Search: id:A060795
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| A060795 |
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Write product of first n primes as x*y with x<y and x maximal; sequence gives value of x. |
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+0
2
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| 1, 2, 5, 14, 42, 165, 714, 3094, 14858, 79534, 447051, 2714690, 17395070, 114371070, 783152070, 5708587335, 43848093003, 342444658094, 2803119896185, 23619540863730, 201813981102615, 1793779293633437, 16342050964565645
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OFFSET
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1,2
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COMMENT
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Or, lower central divisor of n-th primorial.
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FORMULA
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a(n)=A060775[A002110(n)] - Labos E. (labos(AT)ana.sote.hu), Apr 27 2001
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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)=3094 and 3094<A000196(9699690)=3114<3135.
2*3*5*7 = 210 = 14*15 with difference of 1, so a(4) = 14.
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CROSSREFS
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Cf. A061055-A061060, A061030-A061033.
Cf. A060755, A000196, A033677.
Sequence in context: A047046 A063545 A061058 this_sequence A071743 A071747 A071751
Adjacent sequences: A060792 A060793 A060794 this_sequence A060796 A060797 A060798
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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 Ed Pegg Jr (ed(AT)mathpuzzle.com), May 28 2001
Terms 16 through 37 computed by Jud McCranie (j.mccranie(AT)comcast.net) Apr 15 2000.
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