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abundant n.  and  octagonal n.

First numbers that belong to both sets:

40, 96, 176, 280, 408, 560, 736, 936, 1160, 1408, 1680, 1976, 2296, 2640, 3008, 3400, 3816, 4256, 4720, 5208, 5720, 5985, 6256, 6816, 7400, 8008, 8640, 9296, 10680, 11408, 12160, 12936, 13736, 14560, 15408, 16280, 18096, 19040, 21000, 22016, 23056, 24120, 26320, 27456, 28616, 29800, 31008, 32240, 34776, 36080, 37408, 38760, 41536, 42960, 44408, 45880, 47376, 48896, 49665, 50440, 52008, 53600, 55216, 56856, 58520, 60208, 61920, 65416, 67200, 69008, 70840, 72696, 76480, 78408, 80360, 82336, 84336, 86360, 90480, 92576, 94696, 96840, 99008, 101200, 103416, 106785, 107920, 110208, 112520, 114856, 117216, 119600, 124440, 126896, 129376, 131880, 136960, 139536, 144760, 147408, 150080, 152776, 155496, 158240, 161008, 163800, 169456, 172320, 175208, 178120, 181056, 184016, 187000, 190008, 193040, 196096, 199176, 202280, 205408, 208560, 211736, 218160, 221408, 224680, 227976, 231296, 234640, 238008, 241400, 244816, 248256, 251720, 255208, 258720, 269400, 276640, 280296, 283976, 287680, 291408, 295160, 297045, 298936, 302736, 306560, 310408, 314280, 318176, 326040, 330008, 334000, 338016, 342056, 346120, 350208, 354320, 358456, 362616, 366800, 371008, 375240, 379496, 383776, 388080, 396760, 401136, 405536, 407745, 409960, 414408, 418880, 427896, 432440, 437008, 441600, 446216, 450856, 455520, 460208, 464920, 469656, 479200, 484008, 488840, 493696, 498576, 503480, 513360, 518336, 523336, 528360, 533408, 538480, 543576, 553840, 559008, 564200, 574656, 579920, 585208, 590520, 601216, 606600, 617440, 622896, 628376, 631125, 633880, 639408, 644960, 656136, 661760, 667408, 673080, 678776, 690240, 701800, 707616, 713456, 719320, 725208, 731120, 737056, 743016, 749000, 755008, 761040, 767096, 779280, 785408, 791560, 797736, 803936, 810160, 816408, 822680, 825825, 835296, 841640, 848008, 854400, 860816, 867256, 873720, 880208, 886720, 893256, 903105, 906400, 913008, 919640, 926296, 932976, 939680, 953160, 959936, 966736, 973560, 980408, 987280, 994176, 1008040, 1015008, 1022000, 1036056, 1043120, 1050208, 1057320, 1064456, 1071616, 1078800, 1086008, 1093240, 1100496, 1107776, 1115080, 1122408, 1129760, 1137136, 1144536.

Some larger examples :