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A134621
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Numbers such that the arithmetic mean of the 4th power of their prime factors is a prime.
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14
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15, 28, 39, 48, 51, 65, 68, 76, 77, 85, 87, 93, 111, 119, 133, 141, 143, 148, 155, 161, 175, 187, 189, 209, 212, 215, 221, 225, 235, 244, 275, 287, 295, 301, 315, 316, 320, 323, 329, 355, 393, 403, 404, 411, 428, 437, 447, 451, 455, 481, 505, 508, 515, 517
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(2)=39, since 39=3*13 and (3^4+13^4)/2=14321 which is prime.
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CROSSREFS
| Cf. A001597, A025475, A134333, A134344, A134376.
Cf. A134600, A134602, A134605, A134608, A134613, A134617, A134619.
Sequence in context: A031334 A178958 A099808 * A106499 A043108 A045192
Adjacent sequences: A134618 A134619 A134620 * A134622 A134623 A134624
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KEYWORD
| nonn
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AUTHOR
| Hieronymus Fischer (Hieronymus.Fischer(AT)gmx.de), Nov 11 2007
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