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 A162201 First differences of A162200. 11
 0, 2, 0, 3, -1, 3, -1, 3, -3, 4, -2, 5, -1, 3, -3, 6, -2, 4, -3, 3, -2, 5, -3, 7, -4, 3, -1, 3, -1, 9, -7, 5, -2, 6, -4, 4, -4, 5, -3, 6, -2, 6, -4, 3, -1, 7, -10, 8, -1, 3, -3, 4, -4, 8, -4, 6, -2, 4, -3, 3, -4, 12, -7, 3, -1, 9, -8, 8, -4, 3, -3, 7, -5, 6, -3, 5, -5, 6, -4, 9, -4, 6, -4, 4, -3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The absolute value of a(n) is also the length of the n-th vertical edge in the graph of the "mountain path" function for prime numbers. See A162200 for the length of the n-th horizontal component. LINKS Omar E. Pol, Graph of the mountain path function for prime numbers Omar E. Pol, Illustration: The mountain path of the primes FORMULA From R. J. Mathar, Jul 15 2009: (Start) a(n) = A052288(n-1) if n >= 2, n even. a(n) = 2 - A052288(n-1) if n >= 3, n odd. (End) MAPLE A031131 := proc(n) ithprime(n+2)-ithprime(n) ; end: A052288 := proc(n) A031131(n)/2 ; end: A160173 := proc(n) if n <= 2 then 2*(n-1); elif n mod 2 = 0 then A052288(n-1) ; else 2-A052288(n-1) ; fi; end: seq(A160173(n), n=1..150) ; # R. J. Mathar, Jul 15 2009 CROSSREFS Cf. A000040, A006005, A008578, A162200, A162202, A162203, A162340, A162341, A162342, A162343, A162344. Sequence in context: A054875 A324115 A029239 * A271722 A029219 A212217 Adjacent sequences:  A162198 A162199 A162200 * A162202 A162203 A162204 KEYWORD easy,sign AUTHOR Omar E. Pol, Jun 28 2009 EXTENSIONS Edited by Omar E. Pol, Jul 02 2009 More terms from R. J. Mathar, Jul 15 2009 STATUS approved

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Last modified October 17 15:01 EDT 2019. Contains 328116 sequences. (Running on oeis4.)