PPL 086 / 177 permanent IDsPrize Problem Ledger · PPLChecked 2026.07.26
Prize Problem LedgerInstitutionalPPL 086Find a one-billion-digit prime

Permanent problem IDPPL 086

Verified openInstitutionalcomputational target

Computational number theory

Find a one-billion-digit prime

Be the first to identify and reproducibly certify a prime number with at least 1,000,000,000 decimal digits.

prime numbersdistributed computingcertification
01

The problem

Be the first to identify and reproducibly certify a prime number with at least 1,000,000,000 decimal digits.

Open since1999program launch
Last checked2026.07.26Catalog verification
02

Reward offers

Offer 01$250,000Electronic Frontier Foundation
Institutional

A probable prime is not enough. The method, algorithm, source and hardware must be disclosed; the result must be reproducible, peer reviewed in an approved journal and independently verifiable.

03

Sources & reading