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A068080 n + phi(n) is a prime. 5
1, 2, 3, 7, 15, 19, 31, 33, 35, 37, 51, 65, 69, 77, 79, 85, 91, 95, 97, 133, 139, 141, 143, 145, 157, 159, 161, 177, 187, 199, 209, 211, 213, 215, 217, 229, 235, 247, 255, 267, 271, 299, 303, 307, 319, 331, 335, 337, 339, 341, 345, 365, 367, 371, 379, 391, 393 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

MATHEMATICA

Select[Range[400], PrimeQ[# + EulerPhi[#]] &] (* Carl Najafi, Aug 22 2011 *)

CROSSREFS

Cf. A050530.

Sequence in context: A165433 A006627 A077161 * A098763 A066044 A066460

Adjacent sequences:  A068077 A068078 A068079 * A068081 A068082 A068083

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 February 16 04:47 EST 2012. Contains 205860 sequences.