id:A068081 - OEIS Search Results

Search: id:A068081

Displaying 1-1 of 1 results found.

page 1

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`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research