1,1

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

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

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);

Cf. A077722.

Sequence in context: A204002 A198300 A054760 * A205837 A262872 A257923

Adjacent sequences: A079104 A079105 A079106 * A079108 A079109 A079110

nonn,base

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

More terms from Sascha Kurz, Feb 10 2003

approved