a-pointer 13 103 811 + 1989233333 ABA 164738 624962 10224242 + 1734028611 aban 13 19 23 + 1990000717 abundant 222 444 618 + 49989702 Achilles 238003927 272004488 918015147 + 1976030303 admirable 222 618 654 + 99220336 alt.fact. 19 alternating 23 29 49 + 989696969 amenable 13 29 49 + 999998001 amicable 280540 360027675 658009485 721522755 apocalyptic 218 222 411 + 29999 arithmetic 13 19 23 + 9999999 balanced p. 211 733 23333 + 1999002079 Bell 203 betrothed 1648 binomial 406 666 3081 + 1984027528 brilliant 49 209 299 + 999511111 c.decagonal 211 911 17111 + 991020811 c.heptagonal 1618 1933 10018 + 1950433948 c.nonagonal 406 7021 140185 + 1984027528 c.octagonal 49 82369 312481 + 1666027489 c.pentagonal 1266 40006 136306 + 1808823256 c.square 13 545 39481 + 950174825 c.triangular 19 46 109 + 1798076260 cake 26 299 4090 + 1965015327 Canada 16999 Carmichael 340561 Chen 13 19 23 + 99959999 congruent 13 23 29 + 9999999 cube 578009537 1009027027 Cunningham 26 399 511 + 1968075768 Curzon 26 29 69 + 199804878 cyclic 13 19 23 + 9989999 D-number 39 69 111 + 7023333 d-powerful 89 209 333 + 9865423 de Polignac 509 599 809 + 99901517 decagonal 151515 156222 500202 + 1540032670 deceptive 7777 11111 130351 + 1891663741 deficient 13 19 23 + 9999999 dig.balanced 19 49 209 + 199890243 Duffinian 39 49 111 + 9998991 eban 46 2006 2030 + 66066066 economical 13 19 23 + 19999999 emirp 13 79 199 + 199333333 emirpimes 26 39 49 + 99929999 equidigital 13 19 23 + 19999999 eRAP 28518 90243 1220549 + 1608329238 esthetic 23 89 545 + 1232121212 Eulerian 26 2036 evil 23 29 39 + 999989991 fibodiv 19 199 911 + 1999999999 Fibonacci 13 89 233 Friedman 1022 1827 4088 + 640264 frugal 14063 98441 112999 + 998016467 gapful 1030 1037 1090 + 1999889991 Gilda 29 49 Giuga 66198 good prime 29 59 311 + 172001287 happy 13 19 23 + 9983333 Harshad 111 133 209 + 1999826829 heptagonal 5688 8037 40132 + 1612099999 hex 19 721 1027 + 1807002919 hexagonal 10011 30135 84666 + 1896263736 hoax 627 654 1111 + 99818181 Hogben 13 111 133 + 1024992241 Honaker 1433 1933 5009 + 998111111 house 933 3563 35555 + 8289108 hungry 2003 hyperperfect 1333 2133 iban 23 103 111 + 777777 iccanobiF 13 39 836 idoneal 13 133 inconsummate 266 411 422 + 999801 insolite 111 111111111 interprime 26 39 69 + 99965853 junction 103 109 111 + 99921951 Kaprekar 999 7777 9999 + 1111111111 katadrome 654 721 763 + 96432 Kynea 23 79 Lehmer 133 511 763 + 1948016071 lonely 23 211 Lucas 29 199 lucky 13 49 69 + 9992727 Lynch-Bell 412 824 1236 + 312648 m-pointer 23 2111 3221111 + 1312111111 magic 111 21621951 magnanimous 23 29 49 + 80009 metadrome 13 19 23 + 2678 Moran 111 133 209 + 99036585 narcissistic 92727 nialpdrome 111 211 222 + 1111111111 nonagonal 46 111 4699 + 1722554325 nude 111 222 333 + 496867896 oban 13 19 23 + 999 octagonal 133 833 1045 + 1976333333 odious 13 19 26 + 999999999 Ormiston 1000231 1900813 10600813 + 1990004329 palindromic 111 222 333 + 1999889991 pancake 29 46 79 + 1645629766 panconsummate 23 39 59 + 721 pandigital 19 1022 2022 + 1980467532 partition 627 2436 pentagonal 3577 10045 15555 + 1793439837 pernicious 13 19 26 + 9998991 Perrin 29 39 209 8090 persistent 1026974358 1053287469 1083697524 + 1872506493 Pierpont 13 19 109 433 plaindrome 13 19 23 + 1999999999 Poulet 35333 83333 256999 + 799808401 power 49 82369 312481 + 1666027489 powerful 49 82369 312481 + 1976030303 practical 666 812 888 + 9964482 prim.abundant 222 618 654 + 99220336 prime 13 19 23 + 1999633333 primeval 13 1037 1012345679 pronic 812 6162 14042 + 1840023920 Proth 13 49 209 + 1484718081 pseudoperfect 222 444 618 + 999999 repdigit 111 222 333 + 1111111111 repfigit 19 repunit 13 111 133 + 1111111111 Rhonda 154462 259333 23757125 + 1624142857 Ruth-Aaron 49 2299 3248 + 1495298701 Saint-Exupery 52005720 240003960 1920031680 Sastry 6099 self 209 211 222 + 999776223 self-describing 4444 224444 666666 + 88888888 semiprime 26 39 46 + 99989999 sliding 29 133 6266 Smith 627 654 666 + 99990243 Sophie Germain 23 29 89 + 1997009009 sphenic 222 266 399 + 99979999 square 49 82369 312481 + 1666027489 star 13 433 1633 + 1702018837 straight-line 111 222 333 + 1111111111 strobogrammatic 69 111 609 + 1818008181 strong prime 29 59 79 + 99949999 subfactorial 1854 super Niven 100110 101010 200220 + 1400200200 super-d 19 69 333 + 9998181 tau 444 824 872 + 998844444 taxicab 40033 320264 1080891 + 1784048168 tetrahedral 3654 4060 273819 + 22108415 tetranacci 29 triangular 406 666 3081 + 1984027528 tribonacci 13 927 19513 trimorphic 49 499 999 + 999999999 truncatable prime 13 23 29 + 29399999 twin 13 19 29 + 999311111 uban 13 19 23 + 1000000099 Ulam 13 26 69 + 10000239 undulating 515 545 818 + 1919191919 unprimeable 206 515 622 + 9986666 untouchable 206 406 818 + 982222 upside-down 19 46 555 + 1919191919 vampire 1827 180297 14300271 + 1976443902 wasteful 26 39 46 + 9999999 weak prime 13 19 23 + 99702439 weird 836 70630 90370 + 801010 Woodall 23 2499 Zuckerman 111 1111 3111 + 1911111111 Zumkeller 222 444 618 + 96888 zygodrome 111 222 333 + 1199999999