A116167 Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 7.

7, 493, 607, 629, 757, 17927, 33247, 93869, 19467217, 31223879, 72757727, 13454739732766891651472740499, 40093333713615672956030023507, 48089152118689474641229584727, 66424317743191484432891678269

Offset

1,1

Links

Table of n, a(n) for n=1..15.

Example

72757727//72757728 = 85298137 * 85298144, where // denotes concatenation.

Crossrefs

Cf. A116160, A115428, A116168, A116180, A116298.

Sequence in context: A119621 A142734 A120773 * A296175 A319831 A122523

Adjacent sequences: A116164 A116165 A116166 * A116168 A116169 A116170

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Status

approved