Missing number is 256
The series is 1,4,27,256,3125 i.e. 1, 2*2, 3*3*3, 4*4*4*4, 5*5*5*5*5
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256
823,543 The pattern is n to the nth power.
The number is 27. (33) The sequence shows the lowest 7 nonzero values for the exponential series nn, i.e. 1 to the first power, 2 to the 2nd power, up to 7 to the 7th power. 1*1=1 2*2=4 3*3*3=27 4*4*4*4=256 5*5*5*5*5=3125 6*6*6*6*6*6=46656 7*7*7*7*7*7*7=823543
46656 as it is 6 to the power of 6. Each in turn is the result of a number to the power of itself.
3125, 46656 This is the sequence I used: * 1 = 11 * 4 = 22 * 27 = 33 * 256 = 44 * 3125 = 55 * 46,656 = 66 * and so on...