1111 is the only one.
Thre are infinitely many solutions. The smalest set with two different triangular number adding to another is 6 + 15 = 21
2100
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If you think about the digits, you can rewrite them as ABBA, with A being one digit and B being another: A can be 1-9 and B can be 0-9. Since A has to be 1, B can be 0-9, leaving 10 palindromic numbers.
Six.
4
1111 is the only one.
There are uncountably infinitely many real numbers between 1080 and 1100. There are 21 integers between 1080 and 1100, including the "endpoints." They are: 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1100.
There are an many triangular numbers that are also square numbers. Simply put, the sum of two consecutive triangular number equals a square number. Examples include 1 and 36.
1100
There are 2 triangular numbers. Those numbers are 36 and 45. 55 is not an answer since it come after 54. If you get this question, this is the answer.
There are seven: 1057, 1064, 1071, 1078, 1085, 1092, 1099.
Thre are infinitely many solutions. The smalest set with two different triangular number adding to another is 6 + 15 = 21
2100
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