NumMemorize vs Collatz Explorer

NumMemorize quizzes you on the digits of well-known constants (such as π, e, √2), and will help you memorize additional digits. This app is a must-have for math and science students, and those wishing to impress teachers, friends and family, or fellow nerds! What party won't be livened up with a 20 digit recall of ϕ (the Golden ratio)? Imagine walking up to the blackboard and writing out √2 to 30, 40, or more digits! Say you're being hustled at a game of pool. Easy, bet your opponent, double or nothing, that you can recount pi to 30, no, even better, 50 digits. Let those other kids fill their heads with useless sports stats. These numbers are timeless and universal! Who knows who you'll impress - armed with this knowledge, you'll probably marry a smarter and better looking spouse, have a better job and live happily ever after! NEW! Now enter your own numbers! You can enter any numbers you'd like: drivers license, card numbers, phone numbers and your own favorite constants and values. Go ahead, enter 99! NEW! You can now just speak your number instead of tapping it in! NumMemorize makes it easy to memorize any number! (99! is 933262154439441526816992388562667004907159682643816214685929638952175999932299156089414639761565182862536979208272237582511852109168640000000000000000000000)

A fun app that is capable of showing you any collatz sequence for a number that you input. Also capable of showing you any sequence from an alternate 3x-1 function for any number you input.