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A214287
Primes of the form phi(n)-1 sorted by increasing n, where phi is the Euler totient function.
2
3, 5, 3, 5, 3, 3, 11, 5, 7, 7, 5, 17, 7, 11, 7, 19, 11, 17, 11, 7, 29, 19, 23, 11, 17, 23, 11, 41, 19, 23, 41, 19, 31, 23, 17, 23, 59, 29, 31, 47, 19, 31, 43, 23, 23, 71, 59, 23, 31, 53, 23, 41, 23, 71, 43, 59, 71, 31, 41, 59, 31, 101, 47, 47, 107, 71, 47, 71, 31, 109, 59, 79, 59, 83
OFFSET
1,1
COMMENTS
Primes in A109606.
LINKS
MATHEMATICA
Select[Table[EulerPhi[n]-1, {n, 1, 1000}], PrimeQ]
CROSSREFS
Cf. A000010, A078892 (associated n), A214288.
Sequence in context: A175999 A236965 A259684 * A010703 A107489 A152050
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jul 13 2012
STATUS
approved