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The smallest prime (out of 363) resulting from the ninedigital fraction equation (A+B)^C + (D+E)^F + (G+H)^I, where the letters A to I represent any combination of the nine digits 1 through 9. Note that (4+5)^3 + (6+8)^2 + (7+9)^1 is the only distinct solution for 941. [De Geest]
The smallest prime formed from the reverse concatenation of three consecutive squares. [Gupta] The smallest number whose proper substrings sum to its reversal, i.e., 9+4+1+94+41 = 149. [Beedassy]
(There are 2 curios for this number that have not yet been approved by an editor.)
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