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emirps
A number is called emirp if it is prime and if its reverse is a different prime, thus excluding palindromic primes.

For example, the prime 31 is also an emirp, since 13 is prime as well.

The smallest 3 × 3 magic square whose entries are emirps is

172071873116493
167631747718191
184611622317747

The first emirps are 13, 17, 31, 37, 71, 73, 79, 97, 107, 113, 149, 157, 167, 179, 199, 311, 337, 347, 359, 389, 701, 709, 733, 739, 743, 751 more terms

Emirps can also be... (you may click on names or numbers and on + to get more values)

a-pointer 13 701 1153 + 199962031 199971329 aban 13 17 31 + 199000831 199000981 alt.fact. 3301819 alternating 107 149 167 + 189898367 189898781 amenable 13 17 37 + 199999661 199999777 apocalyptic 157 937 983 + 19913 19973 arithmetic 13 17 31 + 9999943 9999971 balanced p. 157 733 1103 + 199997003 199999661 bemirp 1061 1091 1601 + 199680881 199800091 c.decagonal 31 1201 1901 + 198607531 199364551 c.heptagonal 71 953 1471 + 194597873 198954211 c.pentagonal 31 1381 11731 + 193578001 196980631 c.square 13 113 761 + 198383281 198622381 c.triangular 31 199 9721 + 198771949 199878589 Carol 16127 1046527 16769023 Chen 13 17 31 + 99999077 99999827 congruent 13 31 37 + 9999463 9999943 constructible 17 Cunningham 17 31 37 + 196953157 199374401 Curzon 113 761 953 + 199998713 199999661 cyclic 13 17 31 + 9999943 9999971 d-powerful 739 3257 3527 + 9983527 9984827 de Polignac 149 337 701 + 99999187 99999343 deficient 13 17 31 + 9999943 9999971 dig.balanced 37 149 709 + 199993361 199999777 economical 13 17 31 + 19999927 19999981 equidigital 13 17 31 + 19999927 19999981 esthetic 12323 32321 1210123 + 101232343 121232101 evil 17 71 113 + 199999777 199999931 fibodiv 149 199 1301 + 3089 9161 Fibonacci 13 1597 Friedman 347 12107 12109 + 937591 976553 good prime 17 37 71 + 199884017 199968443 happy 13 31 79 + 9999337 9999713 hex 37 1657 3169 + 198705547 199145269 Hogben 13 31 73 + 198457657 199162657 Honaker 1091 1301 1913 + 199803013 199901021 hungry 17 iban 17 71 73 + 777373 777421 iccanobiF 13 idoneal 13 37 inconsummate 761 941 971 + 999773 999931 junction 107 113 311 + 99999247 99999259 katadrome 31 71 73 + 986543 9875321 Kynea 79 Leyland 17 lonely 1272749 162821917 Lucas 199 3571 9349 3010349 lucky 13 31 37 + 9998971 9999739 m-pointer 1231 1321 11621 + 131261111 163111111 metadrome 13 17 37 + 345689 1235789 modest 13 79 199 + 199010989 199333333 Motzkin 15511 nialpdrome 31 71 73 + 99996653 99999643 oban 13 17 37 + 967 983 odious 13 31 37 + 199998637 199999061 Ormiston 1913 18379 19013 + 199977797 199994279 pancake 37 79 991 + 196505401 196664029 panconsummate 31 37 73 337 pernicious 13 17 31 + 9999943 9999971 Perrin 17 Pierpont 13 17 37 + 1179649 120932353 plaindrome 13 17 37 + 167999999 177777799 prime 13 17 31 + 199999777 199999931 primeval 13 37 107 + 100279 100379 Proth 13 17 97 + 199213057 199229441 repfigit 1084051 repunit 13 31 73 + 198457657 199162657 self 31 97 389 + 199998559 199999661 self-describing 10233221 10322321 12193133 + 32102321 33322727 star 13 37 73 + 195933061 199238437 strobogrammatic 116911 119611 169691 + 196906961 199609661 strong prime 17 37 71 + 99999343 99999547 super-d 31 107 337 + 9999419 9999931 tribonacci 13 149 trimorphic 751 1249 truncatable prime 13 17 31 + 186342467 198739397 twin 13 17 31 + 199999307 199999309 uban 13 17 31 + 99000029 99000037 Ulam 13 97 739 + 9999071 9999337 upside-down 37 73 1559 + 99782311 99864211 weak prime 13 31 73 + 99999643 99999827 weakly prime 1282529 3326489 10564877 + 198303601 198873523 Wieferich 3511 Woodall 17 zygodrome 11777 77711 1133333 + 118884499 119988899