A156350 a(n)=sum_{k=1..n} r(k) where r(k)=A000002(k) if A000002(k+1)=1 and r(k)=0 if A000002(k+1)=2

0, 0, 2, 3, 3, 5, 5, 5, 7, 7, 7, 9, 10, 10, 12, 13, 13, 13, 15, 15, 17, 18, 18, 20, 20, 20, 22, 23, 23, 25, 26, 26, 28, 28, 28, 30, 30, 30, 32, 33, 33, 35, 35, 35, 37, 37, 39, 40, 40, 42, 43, 43, 43, 45, 45, 45, 47, 48, 48, 50, 50, 50, 52, 52, 52, 54, 55, 55, 57, 58, 58, 60, 60

Offset

1,3

Links

Table of n, a(n) for n=1..73.

Crossrefs

Sequence in context: A066658 A005145 A280740 * A076367 A362840 A302607

Adjacent sequences: A156347 A156348 A156349 * A156351 A156352 A156353

Keyword

nonn

Author

Benoit Cloitre, Feb 08 2009

Status

approved