A156349 a(n)=sum_{k=1..n} r(k) where r(k)=A000002(k) if A000002(k+1)=2 and r(k)=0 if A000002(k+1)=1

1, 3, 3, 3, 4, 4, 5, 7, 7, 8, 10, 10, 10, 11, 11, 11, 12, 14, 14, 15, 15, 15, 16, 16, 17, 19, 19, 19, 20, 20, 20, 21, 21, 22, 24, 24, 25, 27, 27, 27, 28, 28, 29, 31, 31, 32, 32, 32, 33, 33, 33, 34, 36, 36, 37, 39, 39, 39, 40, 40, 41, 43, 43, 44, 46, 46, 46, 47, 47, 47, 48, 48, 49

Offset

1,2

Links

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

Crossrefs

Sequence in context: A270059 A120204 A177018 * A237526 A240117 A333536

Adjacent sequences: A156346 A156347 A156348 * A156350 A156351 A156352

Keyword

nonn

Author

Benoit Cloitre, Feb 08 2009

Status

approved