

A116180


Numbers n such that n concatenated with n+3 gives the product of two numbers which differ by 7.


12



7137, 7767, 47783068991048776635, 48797525371338932241, 55658688122404752991, 56753136503494828605, 85555875266989354735, 86911515887391841491, 95992713077544748491, 97428345698747155255
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OFFSET

1,1


COMMENTS

Also numbers n such that n concatenated with n5 gives the product of two numbers which differ by 9.
Also numbers n such that n concatenated with n+9 gives the product of two numbers which differ by 5.


LINKS

Table of n, a(n) for n=1..10.


EXAMPLE

7767//7770 = 8810 * 8817, where // denotes concatenation.
7767//7762 = 8809 * 8818.
7767//7776 = 8811 * 8816.


CROSSREFS

Cf. A116167, A116179, A116181, A116133, A116311.
Cf. A116114, A116126, A116133, A116258.
Cf. A116207, A116187, A116174, A116351.
Sequence in context: A100539 A260051 A123292 * A252303 A273752 A213097
Adjacent sequences: A116177 A116178 A116179 * A116181 A116182 A116183


KEYWORD

nonn,base


AUTHOR

Giovanni Resta, Feb 06 2006


EXTENSIONS

Edited by N. J. A. Sloane, Apr 12 2007


STATUS

approved



