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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

Table of n, a(n) for n=1..50.

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.)