A252802 Primes whose trajectory under the map x -> A039951(x) enters the cycle {3, 11, 71}.

3, 11, 19

Offset: 1

Author

Felix Fröhlich, Dec 22 2014

Keywords

• nonn
• hard
• more
• bref

Comments

From Felix Fröhlich, Jul 01 2021: (Start)

Further terms in the sequence are 71, 107, 127, 139, 167, 179, etc. The smallest prime where it is unknown whether it is in this sequence (or in A252801 or A252812) is 47.

Is A000040 the union of this sequence, A252801 and A252812? (End)

Examples

			The trajectory of 19 under the given map starts 19, 3, 11, 71, 3, ..., entering the given cycle, so 19 is a term of the sequence.
		

Crossrefs

Cf. A000040, A039951, A244550, A252801, A252812.

Extensions

Name edited by Felix Fröhlich, Jun 19 2021