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A252802
Primes whose trajectory under the map x -> A039951(x) enters the cycle {3, 11, 71}.
7
OFFSET
1,1
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)
EXAMPLE
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
KEYWORD
nonn,hard,more,bref
AUTHOR
Felix Fröhlich, Dec 22 2014
EXTENSIONS
Name edited by Felix Fröhlich, Jun 19 2021
STATUS
approved