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A082721 There exist no palindromic hexagonals of length n. 1
3, 8, 9, 12, 22, 24, 27, 30, 36, 38, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

P. De Geest, Palindromic hexagonals

CROSSREFS

Cf. A034822, A059868, A059869, A059870, A082722, A034307.

Sequence in context: A087286 A165289 A066494 * A239388 A259850 A071677

Adjacent sequences:  A082718 A082719 A082720 * A082722 A082723 A082724

KEYWORD

nonn,base,hard

AUTHOR

Patrick De Geest, Apr 13 2003.

STATUS

approved

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Last modified September 23 06:51 EDT 2018. Contains 315273 sequences. (Running on oeis4.)