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A114340 Largest palindromic divisor of n!! (double factorial = A006882(n)). 0
1, 2, 3, 8, 5, 8, 7, 8, 9, 8, 99, 9, 9009, 252, 9009, 252, 9009, 48384, 969969, 48384, 969969, 405504, 969969, 405504, 969969, 405504, 969969, 525525, 969969, 525525, 79833897, 525525, 133464331, 595595, 5273993725, 595595 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..36.

EXAMPLE

a(16)=252 since 252 is the largest palindromic factor of 16!!= 10321920=252* 40960.

MATHEMATICA

palQ[n_]:= n == FromDigits@Reverse@IntegerDigits@n; Array[Max[Select[Divisors[ #!! ], palQ]] &, 40]

CROSSREFS

Cf. A006882, A093888.

Sequence in context: A268392 A154760 A231817 * A126102 A011433 A126139

Adjacent sequences:  A114337 A114338 A114339 * A114341 A114342 A114343

KEYWORD

base,nonn

AUTHOR

Giovanni Resta, Feb 07 2006

STATUS

approved

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Last modified March 23 05:36 EDT 2019. Contains 321422 sequences. (Running on oeis4.)