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self n.  and  tetrahedral n.

First numbers that belong to both sets:

1, 20, 165, 10660, 17296, 41664, 47905, 57155, 59640, 67525, 161700, 166650, 325500, 1072445, 1394204, 1703016, 1823471, 2001460, 2162940, 2573000, 4022880, 4064785, 4278680, 4366296, 5209260, 6903565, 7023974, 7084700, 7971964, 8649124, 8930376, 9290431, 9437120, 10271580, 10746800, 11571020, 12172369, 12704100, 13436856, 13908836, 14885696, 16757360, 21337260, 21592285, 21849334, 22238720, 22369536, 23299640, 26536591, 27277796, 30380616, 32183329, 33025784, 33710236, 37090735, 38767960, 39529340, 40690000, 44514890, 49013160, 49902940, 52636760, 54040336, 56677949, 57166550, 63512900, 66177440, 75497344, 81861380, 86619610, 88573365, 90556280, 103441604, 116704364, 117099080, 117494685, 122718904, 130629421, 134059345, 136233240, 137989180, 143347400, 153054846, 155428976, 155906729, 157827531, 167167000, 169684535, 173251364, 180534276, 185859436, 194595804, 195150735, 195706720, 199628211, 207627650, 208787579, 225482985, 226095156, 228554920, 229172636, 236041124, 244979536, 250843165, 256133185, 275233231, 275932384, 279445914, 294528520, 301155169, 301897540, 303385940, 317770460, 337380560, 339786594, 341396955, 345445100, 360283244, 382457240, 385947324, 401017110, 415554110, 435161376, 438964660, 450507344, 457333100, 514437560, 518689090, 520823611, 529420255, 541394360, 552435380, 553547666, 580692430, 581842316, 586457040, 587614521, 593424776, 601623295, 632735740, 659884631, 667421314, 673745544, 676286380, 685229601, 703351880, 705966569, 713849500, 717812876, 732470739, 741901580, 743255415, 747326800, 751413026, 793097481, 795929970, 801615164, 826079320, 836295736, 837762064, 851036221, 854004950, 859963104, 933635800, 944718984, 946309420, 951091436, 962312065, 980122220, 991569586, 994856555.