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

1,1

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.

Links

Table of n, a(n) for n=1..21.

Prog

(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

Crossrefs

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

Sequence in context: A352695 A372050 A076386 * A073301 A028756 A028799

Adjacent sequences: A177798 A177799 A177800 * A177802 A177803 A177804

Keyword

nonn,base,more

Author

Vladimir Shevelev, Dec 12 2010

Extensions

Extended by D. S. McNeil, Dec 12 2010

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

Status

approved