A224829 Numbers m, such that there is no solution m = x + y + 3*z, with triangular numbers x, y, z.

8, 17, 26, 35, 44, 53, 62, 71, 77, 80, 89, 98, 107, 116, 125, 134, 143, 152, 158, 161, 170, 179, 188, 197, 206, 215, 224, 233, 239, 242, 251, 260, 269, 278, 287, 296, 305, 314, 320, 323, 332, 341, 350, 359, 368, 377, 386, 395, 401, 404, 413, 422, 431, 440

Offset: 1

Author

Reinhard Zumkeller, Jul 21 2013

Keywords

• nonn

Comments

A224823(a(n)) = 0;

terms not of the form 9*k+8: 77,158,239,320,401,482,563,644,698,... .

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A017257 (subsequence), A000217.

Programs

Haskell

a224829 n = a224829_list !! n
a224829_list = filter ((== 0) . a224823) [0..]