

A160966


Starting from a(1)=2, a(n) = A028260(1+a(n1)) if n is even, a(n) = A026424(a(n1)) if n is odd.


0



2, 6, 11, 25, 45, 94, 176, 361, 700, 1405, 2752, 5533, 10964, 22011, 43839, 87868, 175557, 351746, 703243, 1407705, 2814709, 5631461, 11261009, 22524901, 45044446, 90091251, 180165450, 360333977, 720640449, 1441293048, 2882532607
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

If a(1) were set to 3, the equivalent sequence would start 3, 9, 17, 38, 71, 146, 279,...
Alternatively starting from a(1)=4 we get 4, 10, 18, 39, 72, 150,..


LINKS

Table of n, a(n) for n=1..31.


EXAMPLE

a(2)= 6, the second integer containing an even number of prime factors.
a(3)= 11, the sixth integer containing an odd number of primes.


CROSSREFS

Cf. A141436
Sequence in context: A067605 A072986 A079047 * A052326 A079118 A211054
Adjacent sequences: A160963 A160964 A160965 * A160967 A160968 A160969


KEYWORD

nonn


AUTHOR

Daniel Tisdale, May 31 2009


EXTENSIONS

Definition clarified, sequence extended beyond 25 by R. J. Mathar, May 31 2010
a(15)a(31) from Donovan Johnson, Jul 02 2010


STATUS

approved



