Search a number
centered triangular n.  and  self n.

First numbers that belong to both sets:

1, 31, 64, 514, 760, 1054, 2110, 2224, 8779, 10210, 11224, 13114, 14260, 27949, 30034, 30460, 65209, 67099, 74929, 97921, 100234, 103360, 161869, 164839, 178021, 226399, 244219, 305779, 392449, 398611, 464539, 477991, 496801, 500260, 510709, 570109, 577531, 585001, 694621, 717259, 742369, 776521, 778681, 813649, 840379, 847129, 876691, 949231, 970831, 997561, 1002460, 1097821, 1139269, 1170859, 1293169, 1335289, 1486531, 1498501, 1510519, 1611499, 1683811, 1699741, 1747981, 1803469, 1829881, 1843159, 1853149, 1866511, 1890010, 1896751, 1947691, 2048089, 2086831, 2101009, 2289691, 2319439, 2379511, 2444179, 2459521, 2474911, 2490349, 2501959, 2695411, 2792791, 2854531, 2858671, 3039529, 3177721, 3182089, 3199591, 3234739, 3467881, 3504469, 3518239, 3578221, 3746971, 3765961, 3818431, 3837601, 3861631, 4017199, 4076329, 4091179, 4150849, 4317169, 4357981, 4435021, 4538791, 4544011, 4728601, 4776661, 4857301, 4862701, 4971331, 4993201, 5015119, 5031589, 5186611, 5327011, 5389381, 5526721, 5625049, 5648311, 5671621, 5712529, 5735971, 5759461, 5883571, 5985010, 6051109, 6141829, 6147901, 6337621, 6368491, 6418039, 6486481, 6511459, 6517711, 6713011, 6744781, 6866191, 6995161, 7099201, 7105729, 7256701, 7389271, 7496191, 7529761, 7556671, 7630921, 7691941, 7794181, 7801021, 7903981, 7938451, 7966081, 8014549, 8209891, 8216911, 8357941, 8386291, 8464501, 8528761, 8636401, 8643601, 8658010, 8751961, 8817301, 8926741, 8948710, 8963371, 9073711, 9229321, 9259111, 9311359, 9401269, 9408781, 9521821, 9529381, 9681211, 9711721, 9826561, 9849610, 10112719, 10206409, 10577521, 10681339, 10705369, 10769581, 10801759, 10809811, 11069059, 11167069, 11191639, 11290189, 11298421, 11563429, 11596771, 11755801, 11932831, 12170929, 12445921, 12575881, 12715249, 12785221, 12820279, 12960991, 13495501, 13639861, 13685131, 13857841, 14049991, 14308249, 14336059, 14456881, 14794111, 14831821, 14935771, 14973661, 15011599, 15163831, 15316831, 15364801, 15547771, 15596101, 15946291, 15985441, 16024639, 16054069, 16172059, 16181911, 16339951, 16538581, 16578451, 16688341, 16728391, 16929361, 16939441, 16959610, 17091001, 17294131, 17334901, 17539471, 17703991, 17755561, 17910721, 17952211, 18170821, 18327781, 18538111, 18580321, 18792091, 18802711, 18962371, 18983710, 19058491, 19101289, 19176301, 19219231, 19272961, 19434601, 19445401, 19467010, 19607761, 19705501, 19825291, 19923571, 20087911, 20098891, 20407549, 20440759, 20584981, 20752021, 20942149, 21426931, 21608731, 21620119, 21665701, 21882871, 22297321.

Some larger examples :