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A116167 Numbers n such that n concatenated with n+1 gives the product of two numbers which differ by 7. 5
7, 493, 607, 629, 757, 17927, 33247, 93869, 19467217, 31223879, 72757727, 13454739732766891651472740499, 40093333713615672956030023507, 48089152118689474641229584727, 66424317743191484432891678269 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

EXAMPLE

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

CROSSREFS

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

Sequence in context: A119621 A142734 A120773 * A122523 A203472 A080975

Adjacent sequences:  A116164 A116165 A116166 * A116168 A116169 A116170

KEYWORD

nonn,base

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.