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A057564
Natural numbers n for which the following three properties hold: (i) Phi[Sigma[n]]=2*Phi[n], (ii) Sigma[n-2]=2*Sigma[Phi[n-2]], (iii) Sigma[n+2]=2*Sigma[Phi[n+2]].
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666, 19674, 309114, 369594, 715194, 1180026, 1924794, 2722266, 2741274, 4261914, 5564826, 6296634, 6623226, 6826266, 7206906, 9726648, 15956154, 16046874, 16478874, 19263546, 25333146, 27706554, 28151514, 32938074
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.
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