A079107 Number of digits of A077722(n) written in base 8.

3, 4, 4, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11

Offset

1,1

Links

Table of n, a(n) for n=1..83.

Example

a(5)=6 since A077722(5)=32833, which has an octal form of 100101 (6 digits).

Maple

s := 0:for n from 1 to 7000 do b := convert(n, base, 2): q := sum(b[i]*8^(i-1), i=1..nops(b)): if(isprime(q)) then s := s+1:a[s] := nops(b):fi: od:seq(a[k], k=1..s);

Crossrefs

Cf. A077722.

Sequence in context: A204002 A198300 A054760 * A205837 A262872 A257923

Adjacent sequences: A079104 A079105 A079106 * A079108 A079109 A079110

Keyword

nonn,base

Author

Francois Jooste (phukraut(AT)hotmail.com), Dec 23 2002

Extensions

More terms from Sascha Kurz, Feb 10 2003

Status

approved