A230383 Lexicographically earliest sequence of distinct positive integers such that the first difference contains only distinct positive or negative squares.

1, 2, 6, 5, 14, 10, 26, 17, 42, 78, 29, 4, 53, 37, 101, 20, 120, 56, 137, 16, 160, 60, 24, 145, 314, 25, 221, 52, 277, 21, 310, 85, 341, 197, 521, 80, 441, 41, 482, 121, 605, 76, 476, 152, 681, 105, 730, 54, 630, 146, 822, 38, 767, 142, 926, 1767, 3, 903, 62

Offset

1,2

Comments

Is this a permutation of the positive integers ?

Will every square show up in the first difference ?

Links

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

Paul Tek, Perl program for this sequence

Example

n  a(n)   First difference
-  ----   ----------------
1     1
          +1^2
2     2
          +2^2
3     6
          -1^2
4     5
          +3^2
5    14
          -2^2
6    10
          +4^2
7    26
          ...

Prog

(Perl) See Link section.

Crossrefs

Cf. A081145, A175498, A230455, A230560.

Sequence in context: A193977 A092313 A318358 * A009460 A085205 A094595

Adjacent sequences: A230380 A230381 A230382 * A230384 A230385 A230386

Keyword

nonn

Author

Paul Tek, Oct 17 2013

Status

approved