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

1,2

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.

Sequence in context: A179419 A224549 A339245 * A372695 A043371 A304369

Adjacent sequences: A327281 A327282 A327283 * A327285 A327286 A327287

Keyword

nonn

Author

Benjamin Chaffin, Sep 15 2019

Status

approved