A259711 Numbers that can be written as a product of Catalan numbers.

1, 2, 4, 5, 8, 10, 14, 16, 20, 25, 28, 32, 40, 42, 50, 56, 64, 70, 80, 84, 100, 112, 125, 128, 132, 140, 160, 168, 196, 200, 210, 224, 250, 256, 264, 280, 320, 336, 350, 392, 400, 420, 429, 448, 500, 512, 528, 560, 588, 625, 640, 660, 672, 700, 784, 800, 840

Offset: 1

Author

Ilya Gutkovskiy, Apr 14 2020

Keywords

• nonn

Examples

			70 = 5*14 = C(3)*C(4). - _David A. Corneth_, Mar 26 2021
		

Links

• David A. Corneth, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Catalan Number

Crossrefs

Cf. A000108, A001013, A003046, A005568, A014228, A259711, A342288.