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 A187486 Distance between first and second positions of  A181762(n). 0
 0, 15, 0, 25, 0, 35, 0, 45, 0, 55, 0, 65, 0, 75, 0, 85, 15, 95, 0, 105, 0, 115, 0, 125, 0, 135, 0, 145, 25, 155, 0, 165, 0, 175, 0, 185, 0, 195, 0, 205, 35, 215, 0, 225, 0, 235, 0, 245, 0, 255, 0, 265, 45, 275, 0, 285, 0, 295, 0, 305, 0, 315, 0, 325, 55, 335, 0, 345, 0, 355 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Some entries of A181762 occur twice some only once. The sequence gives the distance between first and second positions of A181762(n), a(n)=0 if A181762(n) occurs only once. The numbers that occur in A181762 only once are 0, 2, 4, 6, 8, 10, 12, 14, 18, 20, 22, 24, 26, 30, 32, 34, 36, 38, 42, 44, 46, ... LINKS CROSSREFS Cf. A181762. Sequence in context: A202857 A055965 A067154 * A141027 A186436 A054670 Adjacent sequences:  A187483 A187484 A187485 * A187487 A187488 A187489 KEYWORD nonn AUTHOR Zak Seidov, Mar 10 2011 STATUS approved

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