A175533 Duplicate of A115760.

3, 7, 19, 55, 139, 859, 2119, 112999, 333679, 10040119, 15363619, 548687179, 16632374359, 5733638351299, 14360489685499, 433098704482699, 44258681327079259, 5009018648920510999

Offset: 1

Author

Zak Seidov, Jun 12 2010

Keywords

• dead

Comments

Or, for i <> j, (a(i) + a(j))/2 are primes.

From a(5)=139 onward, all terms are 19 (mod 20).

Is sequence finite?

Is this a duplicate of A115760? - R. J. Mathar, Jul 22 2010

Yes, the terms are all 3 (mod 4), just as A175533. - Don Reble, Aug 17 2021

Crossrefs

Cf. A115760, A175532.

Extensions

More terms from Don Reble, Aug 17 2021