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 A116173 Numbers k such that k concatenated with k+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 k such that k concatenated with k+7 gives the product of two numbers which differ by 4. If k+2 and k-5 have the same number of digits, the k is also in A116126, because k//k+2 = 10^d*k + k + 2 = m*(m+6) then implies a representation k//k-5 = 10^d*k + k - 5 = m*(m+6)-7 = (m-1)*(m+7). - 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 * A345608 A346282 A088238 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 March 22 18:49 EDT 2023. Contains 361433 sequences. (Running on oeis4.)