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A068366
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Numbers n such that phi(sigma(n)+n)=sigma(n).
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0
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1, 7, 15, 127, 267, 315, 495, 621, 969, 1155, 1917, 5649, 7515, 12267, 14911, 17271, 22347, 26265, 28671, 30549, 31641, 32895, 45195, 48093, 56697, 60801, 64923, 77409, 79827, 82731, 83559, 116745, 123387, 172653, 173901, 179223, 184869
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Are there any even values in the sequence?
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PROG
| (PARI) for(n=1, 300000, if(eulerphi(sigma(n)+n)==sigma(n), print1(n, ", ")))
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CROSSREFS
| Sequence in context: A144536 A032004 A032018 * A156499 A137881 A042725
Adjacent sequences: A068363 A068364 A068365 * A068367 A068368 A068369
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 28 2002
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EXTENSIONS
| More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Apr 22 2002
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