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A034307
Numbers k such that there are no oblong (promic) palindromes of length k.
7
2, 5, 9, 12, 18, 20, 30, 34, 41, 42, 48, 49
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
Elena Deza and Michel Marie Deza, Figurate numbers, World Scientific Publishing (2012), page 278.
LINKS
Table of n, a(n) for n=1..12.
Patrick De Geest, Palindromic pronic numbers of the form n(n+1).
CROSSREFS
Cf. A002378, A028336, A028337.
Sequence in context: A056549 A034806 A226822 * A382162 A239876 A070828
Adjacent sequences: A034304 A034305 A034306 * A034308 A034309 A034310
KEYWORD
nonn,base,hard,more
AUTHOR
Patrick De Geest, Oct 15 1998
EXTENSIONS
a(9)-a(12) from Patrick De Geest's website added by Max Alekseyev, Jun 03 2026
STATUS
approved

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Last modified June 27 16:46 EDT 2026. Contains 396962 sequences.
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