[seqfan] Pseudoprime tails of the numbers 2^p - 2
Tomasz Ordowski
tomaszordowski at gmail.com
Sun Sep 23 13:34:46 CEST 2018
Dear SeqFans!
Let's define:
Primes p such that the product of all prime factors q >= p of 2^p - 2 is a
Fermat pseudoprime to base 2.
These primes p are unexpectedly many.
Data: 11, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, ?
Primes p for which the number 2^p - 2 without the prime factors < p is a
pseudoprime.
The next prime 71 is not in the sequence since 26838337327909507 is not a
pseudoprime [Max Alekseyev].
What are the next terms of this sequence?
Primes that do not have this property are only 2, 3, 5, 7, 13, 71, ...
Please more.
Best regards,
Thomas
_______
Consider similar sequences to other bases.
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