A059870 Numbers n such that there exist no palindromic octagonal numbers of length n.

2, 3, 5, 6, 7, 8, 10, 11, 15, 17, 18, 20, 22, 23, 26, 31, 34

Offset: 1

Author

Patrick De Geest, Feb 15 2000

Keywords

• nonn
• base
• hard

Links

• P. De Geest, Palindromic octagonals

Crossrefs

Cf. A034822, A034307, A059868, A059869, A000567, A057106, A057107.

Extensions

a(13)-a(17) from World!Of Numbers link entered by Michel Marcus, Mar 04 2014