OFFSET
1,1
COMMENTS
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..890
EXAMPLE
n = 17: A232359(17) = 3628, a(17) = 12778940:
A232221(3628) = 12778940, whereas A232221(3628-1) = 12778756 and A232221(3628+1) = 12778920 are both less than a(17), with altitude differences 184 and 20. Therefore a(17) is the altitude of a peak in A232221. It can be identified in oeis.org/A232221/graph as top of a foothill.
n = 461: A232359(461) = 373250, a(461) = -2419822248:
A232221(373250) = -2419822248, whereas A232221(373250-1) = -2419823140 and A232221(373250+1) = -2419823192 are both less than a(461), with altitude differences 892 and 944. Therefore a(461) is the altitude of a peak in A232221. It can be identified in Hans Havermann's third plot (< 1.5 million) as the below-axis peak under the 4 of 400000.
PROG
(Haskell)
a232361 n = a232361_list !! (n-1) -- a232361_list is defined in A232359.
CROSSREFS
KEYWORD
sign
AUTHOR
Reinhard Zumkeller, Nov 24 2013
STATUS
approved