A225070    Least decagonal (10-gonal) number that is the product of n decagonal numbers greater than 1.

10, 69300, 9729720, 4257000, 967412160, 4104100000, 1408951239696000, 59860503846000000, 1542547619019487080000, 39054496014386012160000, 450510331438947780000000

1	10
2	69300
3	9729720
4	4257000
5	967412160
6	4104100000
7	1408951239696000
8	59860503846000000
9	1542547619019487080000
10	39054496014386012160000
11	450510331438947780000000


a(1) = 10 = dec(2) = dec(2)
Indices: 2
Values:  10

a(2) = 69300 = dec(132) = dec(2) * dec(42)
Indices: 2,42
Values:  10,6930

a(3) = 9729720 = dec(1560) = dec(3) * dec(4) * dec(42)
Indices: 3,4,42
Values:  27,52,6930

a(4) = 4257000 = dec(1032) = dec(2)^3 * dec(33)
Indices: 2,2,2,33
Values:  10,10,10,4257

a(5) = 967412160 = dec(15552) = dec(2) * dec(3) * dec(4) * dec(8) * dec(9)
Indices: 2,3,4,8,9
Values:  10,27,52,232,297

a(6) = 4104100000 = dec(32032) = dec(2)^3 * dec(4) * dec(7) * dec(11)
Indices: 2,2,2,4,7,11
Values:  10,10,10,52,175,451

a(7) = 1408951239696000 = dec(18768000) = dec(2)^2 * dec(3) * dec(4)^2 * dec(22) * dec(161)
Indices: 2,2,3,4,4,22,161
Values:  10,10,27,52,52,1870,103201

a(8) = 59860503846000000 = dec(122332032) = dec(2)^4 * dec(4) * dec(15) * dec(18) * dec(165)
Indices: 2,2,2,2,4,15,18,165
Values:  10,10,10,10,52,855,1242,108405

a(9) = 1542547619019487080000 = dec(19637640000) = dec(2)^3 * dec(3) * dec(4) * dec(6) * dec(11) * dec(13) * dec(2755)
Indices: 2,2,2,3,4,6,11,13,2755
Values:  10,10,10,27,52,126,451,637,30351835

a(10) = 39054496014386012160000 = dec(98811052032) = dec(2)^4 * dec(4) * dec(8) * dec(9) * dec(16) * dec(81) * dec(104)
Indices: 2,2,2,2,4,8,9,16,81,104
Values:  10,10,10,10,52,232,297,976,26001,42952

a(11) = 450510331438947780000000 = dec(335600332032) = dec(2)^4 * dec(3) * dec(4)^2 * dec(7) * dec(11) * dec(49) * dec(455)
Indices: 2,2,2,2,3,4,4,7,11,49,455
Values:  10,10,10,10,27,52,52,175,451,9457,826735