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A066850
Numbers n such that phi(phi(n)) + sigma(sigma(n)) = phi(sigma(n)) + sigma(phi(n)), where phi=
A000010
is Euler's totient function and sigma=
A000203
is the sum of divisors function.
+0
4
1, 4, 2669, 9559, 15293, 32583, 36593, 38443, 255367, 257239, 273977, 283391, 314101, 421553, 488363, 532975, 768699, 839973, 871757, 1960479, 2337221, 2374867, 3084659, 3326653, 3735029, 4440017, 5387373, 7930439, 8114377
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Maintained by
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
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