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centered heptagonal n.  and  Curzon n.

First numbers that belong to both sets:

1, 386, 638, 953, 3473, 5741, 10781, 11978, 14561, 39698, 41966, 111518, 115298, 174833, 219626, 263726, 275381, 311858, 357281, 377693, 412973, 496133, 612998, 676061, 704033, 771506, 926486, 948221, 1037681, 1203938, 1616021, 1976633, 2024261, 2121218, 2270906, 2531726, 2567573, 2658293, 2713481, 2863421, 2997926, 3115673, 3135518, 3316958, 3440753, 3503501, 3673601, 3980978, 4162166, 4778873, 4927238, 4952186, 5128586, 5308073, 5333966, 5569838, 5783786, 5946893, 6223778, 6392933, 7609526, 7827821, 7859258, 8338373, 8403326, 8698733, 9236501, 9755306, 10002266, 10073393, 10614878, 10946573, 11548853, 11740373, 12050081, 12363821, 13084478, 13452461, 13993001, 15149681, 15412958, 15856793, 16488746, 16580033, 17319401, 18027206, 18846521, 19189178, 19983986, 20692673, 21103181, 21258161, 21621986, 22465178, 23216201, 23324498, 23760206, 24144758, 24199946, 25035326, 25147781, 25486658, 26056493, 26401418, 27332306, 27744641, 27803798, 27863018, 27922301, 30160061, 30221738, 31217138, 31847453, 32228666, 32676281, 33710993, 36436058, 37116773, 38149658, 39126473, 39196718, 39902633, 40257953, 40973318, 41550146, 41985413, 45020438, 46769381, 47617613, 48083498, 48708206, 50049098, 50686406, 51892226, 54512018, 56014001, 56434841, 57366233, 57877478, 57962906, 59165513, 59858261, 60032078, 61431686, 64820393, 64910798, 66365846, 67929506, 68022053, 68485733, 71016821, 74076101, 76118813, 77199893, 77693813, 77990921, 78586838, 82617578, 82719638, 82821761, 83538386, 85084406, 85291613, 90340181, 90874421, 91947626, 92055293, 93677858, 95205041, 95533901, 96965513, 97076078, 98073998, 98742113, 98853686, 100760066, 103368266, 105087221, 105432713, 107052506, 107284913, 108801701, 108918818, 111985973, 114494381, 115698626, 116666558, 117395153, 117516806, 117760301, 118492298, 118736801, 119717333, 124304741, 125307953, 125559386, 126567638, 127326473, 128468978, 128596238, 131540606, 132831161, 133608518, 137003273, 138056381, 138716621, 139776281, 140839973, 141106526, 142041446, 144189998, 145541033, 147579398, 148809221, 149906681, 150594641, 150870266, 151698653, 153084338, 157560866, 160675901, 162101906, 162244853, 164540573, 165261293, 169034426, 170057546, 173884733, 174922406, 178203761, 182272553, 184552838, 185468921, 185774786, 186847298, 189155933, 191634101, 193035158.