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 A172470 First differences of A172468. 4
 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9, 52, 9, 61, 61, 9, 52, 9, 52, 9, 61, 61, 9, 52, 9, 61, 61, 61, 9 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The numbers in the sequence are conjectured to be restricted to 9,52, or 61. Note that 61-52 = 9, (52+2)/(61-52) = (52+2)/9 = 6, (61+2)/(61-52) = (61+2)/9 = 7 and we have lcm(9,52,61) =28548 = 13^4 - 13 and (52+2)/9 + (61+2)/9 = 6+7 = 13. LINKS FORMULA a(n) = A172468(n+1) - A172468(n). CROSSREFS Cf. A172468, A167389. Sequence in context: A181161 A152580 A197722 * A120665 A163941 A289418 Adjacent sequences:  A172467 A172468 A172469 * A172471 A172472 A172473 KEYWORD nonn AUTHOR Stephen Crowley, Feb 04 2010 STATUS approved

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Last modified March 28 06:09 EDT 2020. Contains 333073 sequences. (Running on oeis4.)