A230383 -id:A230383 - cp's OEIS frontend

A230560 a(n)*|a(n)| gives the first difference of A230383.

1, 2, -1, 3, -2, 4, -3, 5, 6, -7, -5, 7, -4, 8, -9, 10, -8, 9, -11, 12, -10, -6, 11, 13, -17, 14, -13, 15, -16, 17, -15, 16, -12, 18, -21, 19, -20, 21, -19, 22, -23, 20, -18, 23, -24, 25, -26, 24, -22, 26, -28, 27, -25, 28, 29, -42, 30, -29, 31, -30, 32, -33

Offset: 1

Paul Tek, Oct 23 2013

sign

This sequence contains only distinct terms, different from 0.

Paul Tek, Table of n, a(n) for n = 1..10000

Cf. A230383, A230565.

A230455 Lexicographically earliest sequence of distinct positive integers such that the absolute value of the first difference contains only distinct squares.

Original entry on oeis.org

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

Paul Tek, Oct 19 2013

nonn

Is this a permutation of the positive integers ?

Will every square show up in the absolute value of the first difference ?

			The first differences of 1, 2, 6, 15, 31,... are 1^2, 2^2, 3^2, 4^2, 5^2, 7^2, 6^2,...

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

Cf. A081145, A175498, A230383, A230455.

Perl
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See Link section.
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cp's OEIS Frontend

A230560 a(n)*|a(n)| gives the first difference of A230383.

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