See A220697. Cheers, Robert On Jan 17 2023, zak seidov via SeqFan wrote: > Dear seqfans, Can You find 17 and more consecutive primes such that all > first differences are semiprimes? P.S. 17 is my current record. Zak > Seidov zakseidov at yahoo.com > >-- >Seqfan Mailing list - http://list.seqfan.eu/ > >