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A068014 Nonprimes n such that 1+Phi[n] and -1+Sigma[1,n] are prime numbers. +0
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6, 10, 14, 21, 26, 34, 38, 40, 46, 55, 57, 58, 60, 63, 74, 76, 86, 88, 93, 111, 114, 117, 118, 124, 126, 135, 145, 153, 158, 166, 178, 184, 186, 190, 194, 198, 206, 208, 209, 216, 221, 224, 230, 232, 238, 250, 252, 254, 260, 266, 270, 278, 280, 295, 297, 298 (list; graph; listen)
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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.


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