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#include <iostream> int main() { std::cout << "1 121 12321 1234321" << std::endl; return 0; }
21 The pattern is 121, 12321, 1234321
121, 484, 12321, 1234321, 123454321, 12345654321, 1234567654321, 123456787654321, 1234567897654321, 1002001, 10201, 100020001, 10000200001, 1000002000001
A number that reads the same backwards as it does forwards. For example 1357531, or 121.
Palindromic numerical sequences are series of numbers that read the same when read either forward or backward, such as: 6 121 474 12321 22522 459878954