1,2

This sequence is known to be a permutation of positive integers, along with its parent sequence (A129198).

In the paper of Slater and Velez it is shown that both this sequence and its parent are permutations of positive integers.

Table of n, a(n) for n=1..45.

P. J. Slater and W. Y. Velez, Permutations of the Positive Integers with Restrictions on the Sequence of Differences, Pacific J. Math., 71, 1977

This is the absolute difference of A129198, Cf. A081145.

Sequence in context: A082333 A162728 A127300 * A211164 A097018 A127541

Adjacent sequences: A129196 A129197 A129198 * A129200 A129201 A129202

nonn

Ferenc Adorjan (fadorjan(AT)freemail.hu or ferencadorjan(AT)gmail.com), Apr 04 2007

approved