A116297 Numbers k such that k*(k+4) gives the concatenation of two numbers m and m+1.

2, 5, 43, 54, 38161, 61836, 83616, 346978, 653019, 950049, 8647553, 9534263, 8167822281, 9007920990, 9209900790, 9950000499, 4737445289219, 4990568257185, 5009431742812, 5262554710778, 8373808925583

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Crossrefs

Cf. A115428, A116288, A116296, A116298, A116317.

Sequence in context: A246669 A208302 A273398 * A215170 A286871 A027730

Adjacent sequences: A116294 A116295 A116296 * A116298 A116299 A116300

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved