A022775 Place where n-th 1 occurs in A007336.

1, 3, 6, 11, 17, 25, 34, 44, 56, 69, 84, 100, 117, 136, 156, 178, 201, 226, 252, 279, 308, 338, 370, 403, 437, 473, 510, 549, 589, 631, 674, 718, 764, 811, 860, 910, 961, 1014, 1068, 1124, 1181, 1239, 1299, 1360, 1423, 1487, 1553, 1620, 1688

Offset

1,2

Links

Table of n, a(n) for n=1..49.

Formula

a(n) = 1 + Sum_{k=1..n-1} ceiling(sqrt(2)*k). - Benoit Cloitre, Jan 24 2009

Prog

(PARI) a(n)=1+sum(k=1, n-1, ceil(sqrt(2)*k)) \\ Benoit Cloitre, Jan 24 2009

Crossrefs

Cf. A007336.

Sequence in context: A294397 A003022 A025722 * A025743 A022338 A263807

Adjacent sequences: A022772 A022773 A022774 * A022776 A022777 A022778

Keyword

nonn

Author

Clark Kimberling

Status

approved