A293667 First difference of A293666.

2, 3, 5, -7, 11, -13, 17, 19, -31, 23, 29, -47, 37, -41, 43, 53, -83, 59, -71, 61, 67, -127, 73, 79, -157, 89, 97, -173, 101, -103, 107, -109, 113, 131, -241, 137, 139, -271, 149, -151, 163, 167, -337, 179, 181, -349, 191, 193, -383, 197, -199, 211, 223, -431

Offset: 1

Author

Rémy Sigrist, Oct 14 2017

Keywords

• sign

Comments

For any n > 0, |a(n)| is prime.

Examples

			a(10) = A293666(11) - A293666(10) = 30 - 7 = 23.
		

Crossrefs

Cf. A293666.