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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 (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: A289402 A289458 A236111 * A141126 A056520 A289961

Adjacent sequences:  A230452 A230453 A230454 * A230456 A230457 A230458

KEYWORD

nonn

AUTHOR

Paul Tek, Oct 19 2013

STATUS

approved

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Last modified June 19 12:57 EDT 2019. Contains 324222 sequences. (Running on oeis4.)