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A068081 n + phi(n) and n -phi(n) are primes. +0
1
15, 33, 35, 51, 65, 77, 91, 95, 143, 161, 177, 209, 213, 215, 217, 247, 255, 303, 335, 341, 371, 411, 427, 435, 447, 455, 533, 545, 561, 573, 591, 611, 665, 707, 713, 717, 779, 803, 871, 917, 933, 965, 1001, 1041, 1067, 1105, 1115, 1133, 1157, 1159, 1211 (list; graph; listen)
OFFSET

1,1

MATHEMATICA

Select[ Range[1500], PrimeQ[ # + EulerPhi[ # ]] && PrimeQ[ # - EulerPhi[ # ]] & ]

CROSSREFS

Cf. A050530, A068080.

Adjacent sequences: A068078 A068079 A068080 this_sequence A068082 A068083 A068084

Sequence in context: A089966 A050384 A053343 this_sequence A089967 A064900 A085371

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 17 2002

EXTENSIONS

Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 18 2002

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.


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