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A230455
Lexicographically earliest sequence of distinct positive integers such that the absolute value of the first difference contains only distinct squares.
4
1, 2, 6, 15, 31, 56, 7, 43, 107, 26, 126, 5, 149, 318, 29, 225, 450, 9, 265, 589, 13, 374, 774, 45, 529, 1058, 34, 659, 1335, 39, 823, 1664, 64, 964, 3, 1092, 2248, 132, 1357, 2726, 22, 1466, 2987, 71, 1752, 3516, 35, 1884, 3820, 99, 2124, 4333, 108, 2412
OFFSET
1,2
COMMENTS
Is this a permutation of the positive integers ?
Will every square show up in the absolute value of the first difference ?
EXAMPLE
The first differences of 1, 2, 6, 15, 31,... are 1^2, 2^2, 3^2, 4^2, 5^2, 7^2, 6^2,...
PROG
(Perl) See Link section.
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Tek, Oct 19 2013
STATUS
approved