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Question Number 46045 by Tawa1 last updated on 20/Oct/18
A number is said to be ′′right prime′′ if despite dropping the left most  digits successively,  Number continues to be a prime number.    For example:  223 is a right prime because despite dropping 2 from left  most part, we obtain  23 as the prime number. Next, even after dropping   2 from left,  3 is a prime.       How many two digit numbers are right prime ?
Anumberissaidtoberightprimeifdespitedroppingtheleftmostdigitssuccessively,Numbercontinuestobeaprimenumber.Forexample:223isarightprimebecausedespitedropping2fromleftmostpart,weobtain23astheprimenumber.Next,evenafterdropping2fromleft,3isaprime.Howmanytwodigitnumbersarerightprime?
Answered by MJS last updated on 20/Oct/18
we only have to check x3 and x7  13 17 23 37 43 47 53 67 73 83 97  11 numbers
weonlyhavetocheckx3andx7131723374347536773839711numbers
Commented by Tawa1 last updated on 20/Oct/18
God bless you sir
Godblessyousir

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