id:A086402 - OEIS Search Results

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Nontrivial numbers which are prime and yield another prime when their digits are sorted in descending order.

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13, 17, 37, 79, 113, 131, 149, 157, 163, 167, 179, 181, 191, 197, 199, 241, 251, 281, 313, 337, 347, 359, 373, 389, 419, 461, 463, 491, 563, 571, 593, 613, 617, 683, 719, 787, 797, 839, 919, 1163, 1181, 1193, 1217, 1223, 1229, 1237, 1249, 1259, 1279, 1297 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Primes with digits already in descending order (like 311 and 3221) are trivial cases and are therefore excluded.`
	EXAMPLE	`a(1)=13 because a descending sort of 13's digits yields 31 which is also prime. a(100)=2411 because a descending sort of 2411's digits yields 4211 which is also prime.`
	CROSSREFS	`Cf. A003459.` `Sequence in context: A069485 A166681 A109308 this_sequence A039290 A045267 A043113` `Adjacent sequences: A086399 A086400 A086401 this_sequence A086403 A086404 A086405`
	KEYWORD	`base,nonn`
	AUTHOR	`Chuck Seggelin (barkeep(AT)plastereddragon.com), Jul 07 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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