A248639 Least nonnegative sequence which does not contain a 4-term equidistant subsequence (a(n+k*d); k=0,1,2,3) in arithmetic progression.

0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 2, 0, 0, 0, 1, 0, 1, 1, 1, 2, 2, 2, 0, 0, 2, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 2, 2, 1, 2, 1, 2, 2, 4, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 1, 1, 1, 2, 0, 1, 0, 0, 0, 1, 1, 1, 2, 3, 1, 2, 1, 1, 1, 2, 2, 0, 2, 2, 2, 4, 4, 3, 0, 0, 0, 2, 0, 1, 2, 0, 4, 2, 1, 5, 0, 2, 1, 1, 2, 1, 0, 0, 2, 2, 0, 0, 0, 3, 0, 0, 1, 1, 1, 4, 1, 2, 3, 0, 1, 2, 1, 0, 3, 3, 4, 1, 1, 3

Offset

0,14

Comments

See A248625 for more information, links and examples.

See A248641 for the "positive integers" variant.

Links

Table of n, a(n) for n=0..131.

Prog

(PARI) a=[]; for(n=1, 190, a=concat(a, 0); while(hasAP(a, 4), a[#a]++)); a \\ See A248625 for hasAP().

Crossrefs

Cf. A248625, A248640, A248641, A248627, A229037, A241752.

Sequence in context: A131371 A319195 A003475 * A293959 A333146 A135767

Adjacent sequences: A248636 A248637 A248638 * A248640 A248641 A248642

Keyword

nonn

Author

M. F. Hasler, Oct 10 2014

Status

approved