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 A116180 Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 7. 12
 7137, 7767, 47783068991048776635, 48797525371338932241, 55658688122404752991, 56753136503494828605, 85555875266989354735, 86911515887391841491, 95992713077544748491, 97428345698747155255 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. LINKS 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

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Last modified June 28 11:00 EDT 2022. Contains 354905 sequences. (Running on oeis4.)