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A131753
Number of ways of choosing the largest subset of {1,2,...,n} such that no two distinct elements differ by a perfect square > 1.
3
1, 3, 7, 15, 23, 35, 53, 80, 134, 188, 266, 376
OFFSET
1,2
CROSSREFS
KEYWORD
nonn
AUTHOR
Olivier Gérard, Sep 17 2007
STATUS
approved