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Number of digits of A077722(n) written in base 8.
0

%I #9 Mar 31 2012 10:23:02

%S 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,

%T 9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,

%U 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

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

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

%p 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);

%Y Cf. A077722.

%K nonn,base

%O 1,1

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

%E More terms from _Sascha Kurz_, Feb 10 2003