id:A046451 - OEIS Search Results

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Concatenation of the 2 prime factors of composite a(n) is a palindrome.

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4, 9, 25, 39, 49, 69, 119, 121, 129, 159, 219, 249, 259, 329, 339, 403, 469, 669, 679, 1207, 1329, 1589, 1703, 2319, 2321, 2359, 2649, 2701, 3039, 3421, 3503, 3629, 3639, 3899, 4303, 4607, 4839, 5603, 5739, 6209, 6401, 6979, 7269, 7663, 7819, 8203, 8519 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`E.g. 3899 = 7 * 557 -> 7557 is palindromic.`
	CROSSREFS	`Cf. A046447.` `Sequence in context: A046659 A063760 A130448 this_sequence A158142 A158143 A082200` `Adjacent sequences: A046448 A046449 A046450 this_sequence A046452 A046453 A046454`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com), Jul 15 1998.`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research