id:A114340 - OEIS Search Results

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Largest palindromic divisor of n!! (double factorial = A006882(n)).

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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; listen)

	OFFSET	`1,2`
	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: A102631 A100782 A089489 this_sequence A126102 A011433 A126139` `Adjacent sequences: A114337 A114338 A114339 this_sequence A114341 A114342 A114343`
	KEYWORD	`base,nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 07 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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