A116276 Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-2.

70, 79822843, 69852478553064869297984899963805, 77473062193002372448027740546437, 77747359197583788609974143907617, 84341826458653210947638195982113, 85367942837521291760016984490249

Offset: 1

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

Examples

			79822843 * 79822848 = 63716866//63716864, where // denotes concatenation.
		

Crossrefs

Cf. A028557, A116107, A116268, A116275, A116277, A116281.