id:A075024 - OEIS Search Results

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a(1) = 1, a(n) = the largest prime divisor of the number C(n) = concatenation of 1,2,3... up to n then reverse up to 1.

+0
2

1, 11, 37, 101, 271, 37, 4649, 137, 333667, 12345678910987654321, 17636684157301569664903, 2799473675762179389994681, 2354041513534224607850261, 2068140300159522133, 498056174529497 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(5) = 271 as 123454321= 4141271*271.`
	CROSSREFS	`Cf. A075019, A075020, A075021, A075022, A075023.` `Sequence in context: A124479 A140373 A003020 this_sequence A152094 A147556 A120833` `Adjacent sequences: A075021 A075022 A075023 this_sequence A075025 A075026 A075027`
	KEYWORD	`base,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 01 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 03 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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