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 A116173 Numbers n such that n concatenated with n+2 gives the product of two numbers which differ by 6. 9
 6752089, 6448802889351008245, 18894512461523256139943105859903480218905, 31958875438439894736354375209245786214798 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also numbers n such that n concatenated with n+7 gives the product of two numbers which differ by 4. If n+2 and n-5 have the same number of digits, the n is also in A116126, because n//n+2=10^d*n+n+2=k(k+6) then implies a representation n//n-5=10^d*n+n-5 = k(k+6)-7 = (k-1)(k+7). [From R. J. Mathar, Aug 10 2008] LINKS EXAMPLE 6752089//6752091 = 8217107 * 8217113, where // denotes concatenation. 6752089//6752096 = 8217108 * 8217112. CROSSREFS Cf. A116159, A116172, A116174, A116187, A116304. Cf. A115430, A116205, A116207, A116187, A116337. Sequence in context: A309385 A022237 A273753 * A088238 A079015 A185435 Adjacent sequences:  A116170 A116171 A116172 * A116174 A116175 A116176 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 October 17 11:59 EDT 2019. Contains 328110 sequences. (Running on oeis4.)