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Deleting any digit yields a prime… is there a name for this?

elementary-number-theory prime-numbers recreational-mathematics asked Apr 15 '11 at 4:07

math.stackexchange.com

81 votes

How many sides does a circle have?

geometry education circle asked Apr 8 '11 at 19:26

math.stackexchange.com

66 votes

How can I prevent my 8-year-old from spending time with his bad friend?

behavior friends asked Jun 5 '11 at 17:46

parenting.stackexchange.com

34 votes

Need a result of Euler that is simple enough for a child to understand

soft-question big-list education asked May 3 '11 at 16:11

math.stackexchange.com

34 votes

Have you ever realized you can't solve the homework you assigned?

soft-question teaching asked Apr 21 '11 at 18:27

cstheory.stackexchange.com

32 votes

Should I bother teaching buffer overflows any more?

appsec attacks source-code user-education buffer-overflow asked Mar 1 '11 at 3:42

security.stackexchange.com

28 votes

How to build and run a machine room?

power rackspace server-room cooling asked Jun 9 '11 at 17:59

serverfault.com

22 votes

Can we make $\tan(x)$ arbitrarily close to an integer when $x\in \mathbb{Z}$?

calculus real-analysis asked Feb 27 '11 at 16:20

math.stackexchange.com

22 votes

Are “traitor” and “trader” pronounced the same?

pronunciation asked May 22 '12 at 18:22

english.stackexchange.com

20 votes

Is this number transcendental?

irrational-numbers transcendental-numbers asked Mar 5 '11 at 21:57

math.stackexchange.com

Top Answers

What are some examples of a mathematical result being counterintuitive?

math.stackexchange.com

Recommended Math knowledge for programming

math.stackexchange.com

Why would a company care about the price of its own shares in the stock market?

money.stackexchange.com

Intuitive understanding of why the sum of nth roots of unity is $0$

math.stackexchange.com

What is a single word to describe beating someone brutally?

english.stackexchange.com

RSA: is it easy to find the public key from the secret key?

math.stackexchange.com

How do you say $10$ when it's in binary?

math.stackexchange.com

Mathematical continuation of sequence:$\space \ldots, 7,6,6,6,6,6,5,5,5,5,4,4,4,3,3,2,$?

math.stackexchange.com

Why would you ever turn down a raise in salary?

money.stackexchange.com

What set of $10$-digit numbers with $k$ prime factors has largest cardinality?

math.stackexchange.com

Where did the word “logarithm” come from?

math.stackexchange.com

What does $\mathrm{Re}(x)$ mean?

math.stackexchange.com

Proof that there are infinitely many prime numbers starting with a given digit string

math.stackexchange.com

In the absense of a CS degree, how can I “fill in the gaps” so to speak?

programmers.stackexchange.com

Name of a 6 vertices graph

math.stackexchange.com

Difference between $:=$ and $=$

math.stackexchange.com

str = md5( str ), String equals hash value of the string

math.stackexchange.com

What is the longest English word that starts and ends with the same letter?

english.stackexchange.com

Decryption Problem

math.stackexchange.com

No prime number between number and square of number

math.stackexchange.com

What are good dynamics that can improve learning in a web programming course?

programmers.stackexchange.com

How long should someone take classes in a language they don't plan to work professionally in?

programmers.stackexchange.com

Looking for example of well-known app using unsalted hashes

security.stackexchange.com

Intermediate Text in Combinatorics?

math.stackexchange.com

Deleting any digit yields a prime… is there a name for this?

math.stackexchange.com

Calculating the highest possible damage achievable using 6 items from a pool of ~25

math.stackexchange.com