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A101949 Peak-trough transform of the prime-gap sequence (A001223). +0
1
0, 0, 0, 1, -1, 1, -1, 0, 1, -1, 1, 0, -1, 0, 0, 0, -1, 1, 0, -1, 1, -1, 0, 3, 0, -1, 1, -1, 0, 3, -1, 1, -1, 3, -1, 0, 0, -1, 0, 0, -1, 3, -1, 1, -1, 0, 0, 0, -1, 0, 1, -1, 3, 0, 0, 0, -1, 1, 0, -1, 0, 3, 0, -3, 0, 3, -1, 1, -3, 0, 0 (list; graph; listen)
OFFSET

1,24

COMMENT

The peak-trough transform is defined in A101941

EXAMPLE

a(4)=1 because A101949(4) is greater than one nearest neighbor on both sides, i.e. A101949(3) and A101949(5), but no more than one.

CROSSREFS

Cf. A001223, A101941.

Sequence in context: A036860 A119624 A119612 this_sequence A124796 A065714 A110700

Adjacent sequences: A101946 A101947 A101948 this_sequence A101950 A101951 A101952

KEYWORD

sign

AUTHOR

N. Fernandez (primeness(AT)borve.org), Dec 22 2004

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.


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