A284737 A condensed version of A108235.

1, 1, 8, 21, 3040, 20505, 10567748, 103372655

Offset: 1

Author

N. J. A. Sloane, Apr 09 2017

Keywords

• nonn
• more

Comments

Lists only the terms A108235(n) for n == 0 or 3 mod 12.

See A108235, the main entry for this sequence, for more information.

Links

• R. J. Nowakowski, Generalizations of the Langford-Skolem problem, M.S. Thesis, Dept. Math., Univ. Calgary, May 1975. [Scanned copy, with permission.]
• Ana Rechtman, Août 2018, 3e défi, Images des Mathématiques, CNRS, 2018 (in French).

Crossrefs

Cf. A108235.