A232361 Peak values in A232221.

590868, 586496, 392956, 392612, 369532, 371872, 348760, 92820, 98000, 97424, 268428, 7855172, 11351516, 12763068, 12778820, 12778872, 12778940, 14485860, 16971756, 16976632, 17062548, 17065428, 16934020, 33084456, 33100460, 33116544, 32916668, 32921404

Offset: 1

Author

Reinhard Zumkeller, Nov 24 2013

Keywords

• sign

Comments

max{A232221(A232359(n)-1),A232221(A232359(n)+1)} < a(n).

First entry < 0: a(77) = -279411084.

Examples

			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.
		

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..890

Programs

Haskell

a232361 n = a232361_list !! (n-1)  -- a232361_list is defined in A232359.

Formula

a(n) = A232221(A232359(n)).