A101949 Peak-trough transform of the prime-gap sequence (A001223).

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

Offset: 1

Author

Neil Fernandez, Dec 22 2004

Keywords

• sign

Comments

The peak-trough transform is defined in A101941

Examples

			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.