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A059868 There exist no palindromic pentagonals of length n. 4
3, 9, 11, 12, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..5.

P. De Geest, Palindromic pentagonals

CROSSREFS

Cf. A034822, A059869, A059870, A034307, A000326, A028386, A002069.

Sequence in context: A070354 A174565 A074261 * A101735 A101620 A235583

Adjacent sequences:  A059865 A059866 A059867 * A059869 A059870 A059871

KEYWORD

nonn,base,hard

AUTHOR

Patrick De Geest, Feb 15 2000.

STATUS

approved

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