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

1,2

Links

Table of n, a(n) for n=1..37.

Example

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.

Sequence in context: A139479 A078569 A044082 * A045576 A146649 A326314

Adjacent sequences: A161140 A161141 A161142 * A161144 A161145 A161146

Keyword

nonn,base

Author

Claudio Meller, Jun 03 2009, Jun 06 2009

Extensions

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

Status

approved