



1, 1, 2, 3, 2, 5, 6, 4, 5, 3, 8, 9, 7, 4, 11, 12, 8, 10, 11, 6, 17, 14, 15, 13, 18, 14, 13, 7, 20, 18, 16, 17, 9, 26, 21, 19, 10, 29, 23, 20, 22, 23, 12, 35, 24, 25, 26, 27, 28, 25, 32, 30, 28, 33, 35, 29, 15, 44, 33, 31, 16, 47, 36, 32, 34, 37, 19, 56
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OFFSET

1,3


COMMENTS

First occurrence of n have ranks: 1, 3, 4, 8, 6, 7, 13, 11, 12, 18, ...
Second occurrence of n have ranks: 2, 5, 10, 14, 9, 20, ...
Triples of the form (a, b, a+b): (1,1,2), (3,2,5), (5,3,8), (7,4,11), (11,6,17), ... give sequence 2, 5, 8, 11, 17, ....
Every positive integer appears exactly twice.  Charlie Neder, Jan 12 2019


LINKS

Table of n, a(n) for n=1..68.


FORMULA

a(n) = A008619(A064413(n)1) = ceiling(A064413(n)/2).  Charlie Neder, Jan 12 2019


CROSSREFS

Cf. A000027, A008619, A064413.
Sequence in context: A070673 A070669 A218613 * A289386 A088861 A088631
Adjacent sequences: A164909 A164910 A164911 * A164913 A164914 A164915


KEYWORD

nonn,uned


AUTHOR

Paul Curtz, Aug 31 2009


EXTENSIONS

More terms from Charlie Neder, Jan 12 2019


STATUS

approved



