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congruent n.  and  economical n.

First numbers that belong to both sets:

5, 7, 13, 14, 15, 21, 23, 29, 31, 37, 41, 47, 53, 61, 71, 79, 101, 103, 109, 111, 112, 118, 119, 125, 127, 133, 134, 135, 137, 141, 142, 145, 149, 151, 157, 158, 159, 161, 166, 167, 173, 175, 181, 183, 189, 191, 194, 197, 199, 205, 213, 215, 219, 223, 224, 229, 237, 239, 245, 257, 263, 265, 269, 271, 277, 287, 291, 293, 295, 301, 311, 313, 317, 320, 335, 343, 349, 353, 359, 365, 367, 371, 373, 375, 383, 384, 389, 395, 397, 405, 413, 415, 421, 431, 439, 445, 448, 457, 461, 463, 469, 479, 485, 486, 487, 503, 509, 511, 541, 557, 567, 581, 599, 607, 613, 623, 631, 647, 653, 661, 677, 679, 686, 701, 709, 719, 727, 733, 743, 751, 757, 761, 773, 797, 821, 823, 829, 839, 853, 863, 877, 887, 896, 911, 919, 941, 967, 983, 991, 997, 1003, 1005, 1006, 1007, 1013, 1015, 1021, 1022, 1025, 1029, 1031, 1037, 1039, 1046, 1047, 1053, 1055, 1057, 1061, 1063, 1069, 1073, 1077, 1079, 1081, 1085, 1087, 1093, 1094, 1095, 1101, 1103, 1109, 1113, 1117, 1119, 1120, 1125, 1126, 1127, 1134, 1135, 1136, 1141, 1142, 1145, 1149, 1151, 1154, 1157, 1159, 1165, 1167, 1169, 1174, 1175, 1181, 1183, 1185, 1186, 1189, 1191, 1195, 1198, 1201, 1205, 1207, 1213, 1214, 1215, 1217, 1223, 1229, 1231, 1237, 1238, 1239, 1241, 1245, 1246, 1247, 1249, 1253, 1255, 1261, 1262, 1263, 1264, 1269, 1271, 1277, 1279, 1280, 1282, 1285, 1286, 1293, 1294, 1295, 1301, 1303, 1317, 1318, 1319, 1321, 1325, 1327, 1333, 1335, 1343, 1344, 1346, 1349, 1351, 1357, 1358, 1366, 1367, 1372, 1373, 1375, 1376, 1379, 1381, 1382, 1383, 1387, 1389, 1393, 1399.

Some larger examples :