

A081556


Nexttolast term in nth row of A080504.


5



1, 2, 5, 4, 8, 6, 11, 8, 14, 10, 17, 12, 20, 14, 23, 16, 26, 18, 29, 20, 32, 22, 32, 24, 38, 26, 41, 28, 44, 30, 47, 32, 50, 34, 53, 36, 56, 38, 59, 40, 62, 42, 65, 44, 68, 46, 71, 48, 74, 50, 77, 52, 80, 54, 83, 56, 86, 58, 89, 60, 92, 62, 95, 64, 98, 66, 101, 68, 104, 70
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OFFSET

2,2


COMMENTS

If n is odd, a(n) = n1. If n is even, n1 <= a(n) <= 3n/21. For even n up to 100, a(n) = 3n/21 unless n = 2 or 24; are there other exceptions?  Dean Hickerson, Mar 21 2003


LINKS

Table of n, a(n) for n=2..71.


EXAMPLE

a(24)=32 since the 24th row of A080504 can be exhibited as: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 32, y with y = 3^15*5^20*7^21*11^22*13^23*17^23*19^23.


CROSSREFS

Cf. A080504, A080505, A080506, A080507.
Sequence in context: A146101 A206256 A093052 * A187012 A134079 A033686
Adjacent sequences: A081553 A081554 A081555 * A081557 A081558 A081559


KEYWORD

nonn


AUTHOR

Dean Hickerson, Mar 21 2003


STATUS

approved



