^• 739 is a prime number and its reversed number 937 is also prime. Determine 4-digit prime numbers whose reversed be also prime. ^• If number of such primes is a function of number of digits, determine that the function is increasing or not.


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Question Number 51507 by Rasheed.Sindhi last updated on 27/Dec/18

$^{∙} 739 i s a p r i m e n u m b e r a n d$ $i t s r e v e r s e d n u m b e r 937 i s a l s o$ $p r i m e .$ $D e t e r m i n e 4 - d i g i t p r i m e n u m b e r s$ $w h o s e r e v e r s e d b e a l s o p r i m e .$ $^{∙} I f n u m b e r o f s u c h p r i m e s i s a$ $f u n c t i o n o f n u m b e r o f d i g i t s,$ $d e t e r m i n e t h a t t h e f u n c t i o n i s$ $i n c r e a s i n g o r n o t .$
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