A116281 Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-1.

39, 57, 32262231, 67737765, 79321055, 3341093417798787499092, 3861488851737861033960, 4747922651210186579786, 5252077348789813420210, 6138511148262138966036, 6658906582201212500904, 7232275368591793618230

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			79321055 * 79321060 = 62918301//62918300, where // denotes concatenation.
		

Crossrefs

Cf. A028557, A116112, A116276, A116280, A116282, A116289.