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A116180
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Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 7.
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12
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7137, 7767, 47783068991048776635, 48797525371338932241, 55658688122404752991, 56753136503494828605, 85555875266989354735, 86911515887391841491, 95992713077544748491, 97428345698747155255
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OFFSET
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1,1
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COMMENTS
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Also numbers k such that k concatenated with k-5 gives the product of two numbers which differ by 9.
Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 5.
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LINKS
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Table of n, a(n) for n=1..10.
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EXAMPLE
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7767//7770 = 8810 * 8817, where // denotes concatenation.
7767//7762 = 8809 * 8818.
7767//7776 = 8811 * 8816.
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CROSSREFS
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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
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KEYWORD
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nonn,base
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AUTHOR
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Giovanni Resta, Feb 06 2006
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EXTENSIONS
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Edited by N. J. A. Sloane, Apr 12 2007
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STATUS
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approved
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