Posted by deli on Monday, April 29, 2013 at 11:27am.
Consider all 3term geometric sequences with first term 1 and with common ratio the square of an integer between 1 and 1000. How many of these 1000 geometric sequences have the property that the sum of the 3 terms is prime?

algebra  Reiny, Monday, April 29, 2013 at 12:58pm
I did this question here
http://www.jiskha.com/display.cgi?id=1367223190
Somebody called "tsong" disagreed, but clearly did not read my solution, since I "proved" that there is only one such case,
when the GS is 1 , 1, 1
that is, when the common ratio is 1
then 1 + 1^2 + 1^4 = 3 , which is a prime number
conclusion: there is only ONE such sequence.
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