A156261 a(n)=n/2+(1/2)*sum(k=1,n,A000002(A078649(k)+2)-A000002(A078649(k)))

0, 1, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 6, 7, 7, 8, 9, 9, 9, 10, 10, 10, 11, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 16, 17, 17, 17, 18, 19, 19, 20, 21, 21, 22, 23, 23, 23, 24, 24, 25, 25, 25, 26, 27, 27, 27, 28, 28, 29, 30, 30, 31, 31, 32, 33, 33, 34, 34, 34, 35, 35, 35, 36, 37, 37, 38

Offset

1,5

Comments

A000002(A078649(n))=A000002(A078649(n)+1)

Links

Table of n, a(n) for n=1..76.

Crossrefs

Sequence in context: A323080 A194806 A229790 * A071823 A219642 A139338

Adjacent sequences: A156258 A156259 A156260 * A156262 A156263 A156264

Keyword

nonn

Author

Benoit Cloitre, Feb 07 2009

Status

approved