Sha256: 259039ec7331c7ebc0108161a11bd2514e42ce4214cdc5800a14f39171b5d305
Contents?: true
Size: 1.6 KB
Versions: 5
Compression:
Stored size: 1.6 KB
Contents
# coding: utf-8
describe Integer, "#pyramidal" do
@seq = {
# A002411
5 => [0,1,6,18,40,75,126,196,288,405,550,726,936,1183,
1470,1800,2176,2601,3078,3610,4200,4851,5566,6348,
7200,8125,9126,10206,11368,12615,13950,15376,
16896,18513,20230,22050,23976,26011,28158,30420,
32800,35301][1..-1],
# A002413
7 => [1,8,26,60,115,196,308,456,645,880,1166,1508,1911,
2380,2920,3536,4233,5016,5890,6860,7931,9108,
10396,11800,13325,14976,16758,18676,20735,22940,
25296,27808,30481,33320,36330,39516,42883,46436,
50180,54120],
# A002414
8 => [1,9,30,70,135,231,364,540,765,1045,1386,1794,
2275,2835,3480,4216,5049,5985,7030,8190,9471,
10879,12420,14100,15925,17901,20034,22330,24795,
27435,30256,33264,36465,39865,43470,47286,51319,
55575,60060,64780],
# A007586
11 => [0,1,12,42,100,195,336,532,792,1125,1540,2046,
2652,3367,4200,5160,6256,7497,8892,10450,12180,
14091,16192,18492,21000,23725,26676,29862,33292,
36975,40920,45136,49632,54417,59500][1..-1],
# A130566
47 => [1,48,186,460,915,1596,2548,3816,5445,7480,9966,
12948,16471,20580,25320,30736,36873,43776,51490,
60060,69531,79948,91356,103800,117325,131976,
147798,164836,183135,202740,223696,246048,269841,
295120,321930,350316,380323]
}
@seq.each do |k, ns|
ns.to_enum.with_index(1).each do |py, n|
it "returns #{py} for #{k}-pyramidal number #{n}" do
n.pyramidal(k).should == py
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems