Thread: Tetraproths
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Old 2006-02-22, 02:31   #1
Jens K Andersen
 
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Feb 2006
Denmark

3468 Posts
Default Tetraproths

What is missing in this sequence: 8, 12, 16, ...

Define a tetraproth as 4 primes (k*2^n-1, k*2^n+1, 2^n-k, 2^n+k).

An example with 528 and 501 digits:
n = 1662, k = 928985771563090201572026415

Found with prp testing by PrimeForm which also proved k*2^n+/-1.
Marcel Martin's Primo proved 2^n+/-k.
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