A085370 Niven (or Harshad) numbers that are not divisible by 3.

1, 2, 4, 5, 7, 8, 10, 20, 40, 50, 70, 80, 100, 110, 112, 133, 140, 152, 190, 200, 209, 220, 224, 230, 247, 266, 280, 308, 320, 322, 364, 370, 392, 400, 407, 410, 440, 448, 460, 476, 481, 500, 506, 511, 512, 518, 550, 592, 605, 629, 640, 644, 700, 704, 715

Offset: 1

Author

Reinhard Zumkeller, Jun 26 2003

Keywords

• nonn
• base

Comments

a(n) mod A007953(a(n)) = 0 and A007953(a(n)) mod 3 > 0;

Intersection of A005349 and A001651.

Links

• Eric Weisstein's World of Mathematics, Harshad Number

Crossrefs

Cf. A085371.