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Search: id:A069552
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| A069552 |
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Numbers n such that phi(n)=sigma(core(n)) where phi(x) is the Euler totient function, sigma(x) the sum of divisors of x and core(x) the square-free part of x (the smallest integer such that x*core(x) is a square). |
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| 1, 12, 56, 140, 270, 630, 1672, 4180, 6426, 18810, 80104, 93496, 99484, 102856, 116116, 140296, 191862, 200260, 220616, 223938, 224536, 233740, 257140, 350740, 447678, 449442, 522522, 551540, 561340, 702240, 901170
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