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(Another of the Prime Pages' resources)
The Largest Known Primes Icon
 
The nth Prime Page will now find any of the first 2,623,557,157,654,233 primes or π(x) for x up to 100,000,000,000,000,000.

At the Prime Pages we keep a database of the 5,000 largest known primes (plus the top twenty of certain selected types). A commonly requested search is to find all of the primes of the form k.bn+/-1 with restrictions on k and n. This page is designed to make that easy.

Search Database of the Largest Known Primes
for primes of the form: k.bn+/-1
Base b base
Limit on multiplier k
(leave blank for no limit)
minimum
maximum
Limit on exponent n
(leave blank for no limit)
minimum
maximum
Which sign(s)? plus     minus
Find at most number
(other searches)