Berlekamp, E. R. A construction for partitions which avoid long arithmetic progressions. (English) Zbl 0169.31905 Can. Math. Bull. 11, 409-414 (1968). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 35 Documents Keywords:combinatorics × Cite Format Result Cite Review PDF Full Text: DOI Online Encyclopedia of Integer Sequences: a(n) = prime(n)*2^prime(n).