A102890 A102889(n) is at least a(n).

3, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 20, 21, 22, 23, 23, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 31, 31, 32, 33, 33, 34, 34, 35, 36, 36, 37, 37, 38, 38, 39, 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47, 48, 48, 49, 49, 50, 50, 51, 51, 52

Offset

1,1

Links

Table of n, a(n) for n=1..71.

Formula

a(n) = ceiling(3*n^(2/3)).

Example

a(8) = 12 because ceiling(3*8^(2/3)) = ceiling(12) = 12.

Mathematica

Table[Ceiling[3*n^(2/3)], {n, 1, 85}]

Crossrefs

Cf. A102889.

Sequence in context: A036593 A086674 A137203 * A008520 A217129 A336340

Adjacent sequences: A102887 A102888 A102889 * A102891 A102892 A102893

Keyword

easy,nonn

Author

Joseph Biberstine (jrbibers(AT)indiana.edu), Jan 16 2005

Status

approved