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961 (another Prime Pages' Curiosity) |
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The smallest odd composite square m such that m plus sum of the 3^j-th power of the digits of m for j = 1, 2, and 3, are primes: i.e., 961 + 9^3^1 + 6^3^1 + 1^3^1, 961 + 9^3^2 + 6^3^2 + 1^3^2, and 961 + 9^3^3 + 6^3^3 + 1^3^3 are primes. [Firoozbakht]
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