id:A144719 - OEIS Search Results

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Semiprimes whose factors are decimal palindromes when concatenated, omitting multiples of primes less than 11.

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121, 403, 1207, 1243, 1703, 2321, 2701, 3421, 3503, 3629, 4043, 4061, 4069, 4121, 4247, 4303, 4309, 4607, 5603, 6109, 6401, 7663, 8203, 8921, 9329, 9703, 9707, 9943, 10001, 10021, 10187, 10201, 12223, 12283, 12709, 13129, 13801, 14921, 15007 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Presumed infinite.`
	EXAMPLE	`121 = 11 * 11; 1111 is a palindrome.` `4309 = 139 * 31; 13931 is a palindrome.`
	CROSSREFS	`Cf. A002113, A116935` `Sequence in context: A068872 A167721 A128608 this_sequence A017282 A036304 A052082` `Adjacent sequences: A144716 A144717 A144718 this_sequence A144720 A144721 A144722`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Reikku Kulon (reikku(AT)gmail.com), Sep 19 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research