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A177801
Record lengths of chains of consecutive evil primes, starting with A177748(n).
1
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.
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
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