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 A116187 Numbers n such that n concatenated with n+4 gives the product of two numbers which differ by 6. 8
 12, 43, 20440836, 30017751, 61336887, 52400871197755334426147587, 53651708763838760619655612, 56652002793835820319625612, 57952296063256269823192087, 17684775866714240650923831481623 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also numbers n such that n concatenated with n+9 gives the product of two numbers which differ by 4. For proof that this is the same sequence compare A116133. LINKS EXAMPLE 61336887//61336891 = 78317867 * 78317873, where // denotes concatenation. 61336887//61336896 = 78317868 * 78317872. CROSSREFS Cf. A116173, A115429, A116133, A116194, A116318. Cf. A116193, A116180, A116350. Sequence in context: A004636 A136279 A012471 * A009790 A009519 A106808 Adjacent sequences:  A116184 A116185 A116186 * A116188 A116189 A116190 KEYWORD nonn,base AUTHOR Giovanni Resta, Feb 06 2006 EXTENSIONS Edited by N. J. A. Sloane, Apr 11 2007 STATUS approved

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Last modified January 18 00:56 EST 2021. Contains 340249 sequences. (Running on oeis4.)