factordbrpc · fdb
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Enter a value, an expression, or a term with a variable like 10^n+1 to list a range. Switch to Database id to look a number up by its stored id. Reading never stores anything; use Create to add a number to the database. See the expression syntax & functions reference.

P · Proven prime
id #1000000000001257787 378,632 digits
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Interesting number. Slowinski and Gage on a Cray T94, Sept 3 1996 (six hours of Lucas-Lehmer on one CPU): the last record prime not found by GIMPS.

Value

4122457736…27<378632>
term 2^1257787-1
4122457736…27<378632>
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Is factor of

Primality

N+1 primality proofproven prime

Proven by a Morrison (N+1) test, base 0.

N-1 and N+1

From the command linefdb · curl
fdb
fdb number id:1000000000001257787 --detail 2
curl
curl -s 'https://factordb.com:4059/rpc' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"get_number","params":{"target":{"id":1000000000001257787},"decimal":false,"detail":2}}'