A327284 Indices of terms of the Hofstadter Q-sequence (A005185) not used in generating a later term.

1, 216, 361, 429, 451, 599, 766, 774, 775, 778, 792, 793, 820, 849, 863, 882, 968, 1042, 1111, 1215, 1216, 1228, 1407, 1524, 1528, 1542, 1543, 1550, 1551, 1573, 1653, 1672, 1673, 1674, 1675, 1863, 1905, 1920, 1938, 1954, 2078, 2185, 2186, 2187, 2195, 2196, 2277

Offset: 1

Author

Benjamin Chaffin, Sep 15 2019

Keywords

• nonn

Comments

Each term of the Q-sequence is the sum of two previous terms. This sequence gives the Q-sequence terms which appear never to be used as one of those two. In other words, a(n) != x - A005185(x-1), and a(n) != x - A005185(x-2).

Links

• Benjamin Chaffin, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A005185, A076701.