

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
(list;
graph;
refs;
listen;
history;
text;
internal format)



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 ?


LINKS

Paul Tek, Table of n, a(n) for n = 1..10000
Paul Tek, Perl program for this sequence


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

Cf. A081145, A175498, A230383, A230455.
Sequence in context: A289458 A329479 A236111 * A141126 A056520 A289961
Adjacent sequences: A230452 A230453 A230454 * A230456 A230457 A230458


KEYWORD

nonn


AUTHOR

Paul Tek, Oct 19 2013


STATUS

approved



