

A003005


Size of the largest subset of the numbers [1...n] which doesn't contain a 6term arithmetic progression.
(Formerly M0459)


7



1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 9, 10, 11, 12, 13, 13, 14, 15, 16, 17, 17, 18, 19, 20, 21, 22, 22, 22, 23, 23, 23, 24, 25, 25, 26, 27, 28, 28, 29, 30, 31, 31, 31, 32, 33, 34, 34, 35, 36, 37
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

These subsets have been called 6free sequences.


REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Fausto A. C. Cariboni, Table of n, a(n) for n = 1..147
Fausto A. C. Cariboni, Sets that yield a(n) for n = 7..147, May 20 2018.
K. O'Bryant, Sets of Natural Numbers with Proscribed Subsets, J. Int. Seq. 18 (2015) # 15.7.7
Karl C. Rubin, On sequences of integers with no k terms in arithmetic progression, 1973 [Scanned copy, with correspondence]
Z. Shao, F. Deng, M. Liang, X. Xu, On sets without kterm arithmetic progression, Journal of Computer and System Sciences 78 (2012) 610618.
Samuel S. Wagstaff, Jr., On kfree sequences of integers, Math. Comp., 26 (1972), 767771.


CROSSREFS

Cf. A003002, A003003, A003004, A065825.
Sequence in context: A123731 A247973 A195181 * A245321 A006163 A331268
Adjacent sequences: A003002 A003003 A003004 * A003006 A003007 A003008


KEYWORD

nonn


AUTHOR

N. J. A. Sloane.


STATUS

approved



