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deceptive n.  and  triangular n.

First numbers that belong to both sets:

91, 703, 8911, 12403, 38503, 41041, 79003, 115921, 188191, 269011, 286903, 314821, 334153, 385003, 497503, 597871, 721801, 736291, 765703, 873181, 1056331, 1840321, 1869211, 2630071, 3270403, 3913003, 4255903, 4504501, 4909411, 5292631, 5690251, 6186403, 6313681, 6969511, 8134561, 9493903, 9863461, 10403641, 12169711, 12890503, 14652991, 14783203, 14913991, 15913261, 16666651, 18225703, 18736381, 18809911, 20234341, 20310751, 21395611, 21789901, 22028203, 22670011, 24482503, 25158871, 26017291, 27956503, 30244753, 31470211, 32429431, 32914441, 34590403, 35292601, 35595703, 36307981, 37649503, 39547171, 40621591, 41710411, 42702661, 43036003, 46094401, 47253781, 49735351, 53390611, 53638903, 54637831, 58725703, 60033403, 60957361, 62289541, 62423551, 64042903, 67902031, 68182003, 73902403, 74927161, 79398901, 80918281, 81376903, 82452061, 82606231, 85719871, 93591721, 93755971, 96904081, 97071211, 97741171, 104220703, 112702591, 114329881, 116151661, 116701003, 117987841, 118172251, 123771511, 132804253, 133391611, 137340451, 143168581, 145206361, 145410931, 145820503, 149532571, 159874021, 162243091, 164411911, 166595131, 169234003, 170782921, 173678203, 184348801, 185040703, 188985961, 189686503, 193680721, 194389903, 196049701, 196287391, 210812311, 213035761, 220531501, 226366003, 244061371, 254781451, 265731931, 268505551, 277477903, 280312003, 282589651, 286023403, 288324091, 289766701, 299671921, 308550061, 318465703, 326695141, 329769721, 336273211, 345674071, 346305403, 349470703, 361307521, 368113411, 371376631, 374325841, 387491041, 390922741, 391930003, 415108891, 415800703, 418226581, 432224101, 439309261, 457274161, 457637131, 465658903, 469328203, 471905281, 475969231, 483029821, 487890703, 490518181, 490894111, 491646403, 495416503, 498442951, 517567051, 529214311, 545738203, 560907271, 569784403, 576691741, 585281791, 623662903, 630888481, 636442003, 656723161, 679975003, 696447181, 697791403, 705883951, 711304903, 720385903, 732736621, 765245881, 775136251, 776081503, 789375511, 803744371, 808562791, 827980471, 832870891, 842202361, 852081121, 857538991, 877532671, 897756751, 922845241, 929559403, 933184801, 938376181, 949324951, 950371003, 955609903, 962442001, 967714021, 970355431, 980957071, 996431761, 1007713171, 1034283421, 1040295691, 1050721561, 1059541561, 1060646653, 1101376711, 1112103541, 1129146481, 1129716811, 1135428031, 1142300503, 1157839381, 1188646903, 1229956003, 1234125721, 1247875903, 1295074171, 1308544903, 1312845661, 1325172421, 1327026403, 1333215703, 1356241321, 1364378203, 1368769681, 1375684831, 1394632891, 1402248403, 1408610503, 1414987003, 1419459121, 1425860101, 1453548403, 1464568381, 1465217911, 1486078903, 1497221281, 1507746241, 1511042851, 1550214721, 1558913203, 1563607081, 1564278211, 1570997431, 1579079503, 1590564601, 1592595703, 1611615151, 1618435171, 1634861971, 1638294661, 1645859251, 1673513731, 1707704461, 1715427451, 1722463471, 1743657931, 1752172003.

Some larger examples :