A078171 a(n) = A055086(A000040(n)).

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

Offset

1,1

Links

Table of n, a(n) for n=1..72.

Example

n=25:p(25)=97, sequence Union[Floor[97/j]]= {1,2,3,4,5,6,7,8,9,10,12,13,16,19,24,32,48,97}, a[25]=18.

Mathematica

Table[Length[Union[Table[Floor[Prime[w]/j], {j, 1, Prime[w]}]]], {w, 1, 100}]

Crossrefs

Cf. A000040, A055086, A051201, A078172.

Sequence in context: A071754 A266113 A353212 * A157282 A114010 A289188

Adjacent sequences: A078168 A078169 A078170 * A078172 A078173 A078174

Keyword

nonn

Author

Labos Elemer, Nov 27 2002

Status

approved