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

1,1

Links

Table of n, a(n) for n=1..17.

P. De Geest, Palindromic octagonals

Crossrefs

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

Sequence in context: A336487 A028765 A181807 * A179813 A191914 A329898

Adjacent sequences: A059867 A059868 A059869 * A059871 A059872 A059873

Keyword

nonn,base,hard

Author

Patrick De Geest, Feb 15 2000

Extensions

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

Status

approved