A161143 Numbers which can be expressed as the product of numbers made of only fives.

1, 5, 25, 55, 125, 275, 555, 625, 1375, 2775, 3025, 3125, 5555, 6875, 13875, 15125, 15625, 27775, 30525, 34375, 55555, 69375, 75625, 78125, 138875, 152625, 166375, 171875, 277775, 305525, 308025, 346875, 378125, 390625, 555555, 694375, 763125

Offset: 1

Author

Claudio Meller, Jun 03 2009, Jun 06 2009

Keywords

• nonn
• base

Examples

			1 = the empty product;
5 = 5;
125 = 5 * 5 * 5; 275 = 5 * 55; 2775 = 5 * 555.
		

Crossrefs

Cf. A084034, A161140, A161141, A161142, A161144, A161145, A161146, A161147.

Extensions

1 added by N. J. A. Sloane, Dec 04 2017