A177801 Record lengths of chains of consecutive evil primes, starting with A177748(n).

2, 3, 5, 7, 8, 12, 16, 20, 23, 25, 26, 30, 31, 32, 34, 38, 39, 40, 41, 42, 44

Offset: 1

Author

Vladimir Shevelev, Dec 12 2010

Keywords

• nonn
• base
• more

Comments

In contrast to the sequence of all positive integers, where the length of every chain of consecutive evil numbers cannot exceed 2, we conjecture that for the sequence of primes such length is not bounded with growth of n.

Crossrefs

Cf. A177800 (odious version), A177748, A177798, A000069, A001969, A027697, A027699.

Programs

PARI

{l=0;r=0; forprime( p=1, default(primelimit), if( bittest( norml2(binary(p)),0), l>r & print1(r=l ", "); l & l=0, l++))} \\ M. F. Hasler, Dec 12 2010

Extensions

Extended by D. S. McNeil, Dec 12 2010

a(18)-a(21) from Amiram Eldar, Dec 09 2020