A124169 Numbers in A055039 but not in A044075.

238, 494, 750, 910, 926, 942, 952, 958, 1006, 1262, 1518, 1774, 1934, 1950, 1966, 1976, 1982, 2030, 2286, 2542, 2798, 2958, 2974, 2990, 3000, 3006, 3054, 3310, 3566, 3598, 3614, 3630, 3640, 3646, 3662, 3678, 3694, 3704, 3710, 3726, 3742, 3758, 3768

Offset: 1

Author

N. J. A. Sloane, Dec 04 2006

Keywords

• nonn
• base

Comments

Numbers whose base 4 representation ends in 3,2 followed by some number of zeros and includes at least one other 3,2. This means that, in spite of the initial terms, asymptotically most members of A055039 are not in A044075. In fact, A055039 has density 1/12, while A044075 has density zero. - Franklin T. Adams-Watters, Dec 04 2006

Links

• R. J. Mathar, Table of n, a(n) for n=1..3449

Programs

PARI

{ hex14(n)=local(m);m=n;while(m,if(m%16==14,return(1));m\=16);0 }
for(n=1,10^4, k=n; while(k%4==0,k\=4); if(k%16!=14,next); if(hex14(k-14)||hex14((k-14)\4),print1(n,",")) ) \\ Max Alekseyev, Dec 04 2006

Extensions

More terms from Max Alekseyev and Klaus Brockhaus, Dec 04 2006