fibonacci palindrome random-number-generators factorial prime-numbers fibonacci-series fibonacci-numbers print-patterns armstrong-number fibonacci-series-using-recursion prime-number-using-method prime-number-using-another-way find-prime-numbers-between-two-numbers factorial-using-loop factorial-using-recursion use-random-class thread-local-random generate-random-number-using-int left-triangle-star-pattern pyramid-star-pattern