-A triangular number is a number that is the sum of the integers from 1 to some integer n. Thus 1 is a triangular number because it's the sum of the integers from 1 to 1; 6 is a triangular number because it's 1+2+3=6.

Given the non-negative integer n, create a list of the first n triangular numbers. Thus is n was 5, the list would be: [1, 3, 6, 10, 15]. Associate the list with the variable triangulars.

-Given that d refers to a dictionary and that x has been defined, delete the dictionary entry whose key is equal to the value associated with

-Given a variable, unproved_conjectures, that is associated with a dictionary that maps the common names of mathematical conjectures to the years when the conjectures were made, write a statement that deletes the entry for "Fermat's Last Theorem".