A388291 The odd Markoff numbers.

1, 5, 13, 29, 89, 169, 233, 433, 985, 1325, 1597, 2897, 4181, 5741, 7561, 9077, 14701, 28657, 33461, 43261, 51641, 75025, 96557, 135137, 195025, 294685, 426389, 499393, 514229, 925765, 1136689, 1346269, 1441889, 1686049, 2423525, 2922509

Offset

1,2

Links

Table of n, a(n) for n=1..36.

Formula

a(n) = A002559(A388292(n)), for m >= 1.

a(n) = 1 + 4*A309376(A388292(n)), for n >= 1.

Example

a(1) = 1 = 1 + 4*A309376(1) = 1 + 4*0.
a(3) = 13 = 1 + 4*A309376(4) = 1 + 4*3.

Crossrefs

Cf. A002559, A309376, A388290 (even case), A388292.

Sequence in context: A337761 A147278 A268963 * A147349 A147288 A146420

Adjacent sequences: A388288 A388289 A388290 * A388292 A388293 A388294

Keyword

nonn,easy

Author

Wolfdieter Lang, Sep 16 2025

Status

approved