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 A086402 Nontrivial numbers which are prime and yield another prime when their digits are sorted in descending order. 2
 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; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes with digits already in descending order (like 311 and 3221) are trivial cases and are therefore excluded. LINKS 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: A109308 A263241 A246944 * A271050 A039290 A045267 Adjacent sequences:  A086399 A086400 A086401 * A086403 A086404 A086405 KEYWORD base,nonn AUTHOR Chuck Seggelin (barkeep(AT)plastereddragon.com), Jul 07 2003 STATUS approved

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Last modified July 29 13:28 EDT 2021. Contains 346346 sequences. (Running on oeis4.)