What is sum of first k +ve numbers?
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Find two positive integers such that the sum of the first number and four times the second number is 1000 and the product of the numbers is as large as possible.
The average of three numbers is 42. The first two numbers differ by 1 and the average second and third number is 47. What are the three numbers
How many of the first ten numbers of the sequence 121, 11211, 1112111,... are prime numbers?