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A138537
Primes p_n for which A140141(n) = 2p_n, where p_n = n-th prime (A000040).
7
11, 23, 29, 31, 47, 53, 59, 67, 71, 79, 83, 103, 107, 127, 131, 137, 139, 149, 151, 167, 173, 179, 191, 197, 199, 211, 223, 227, 229, 239, 251, 263, 269, 271, 283, 293, 307, 311, 317, 331, 347, 359, 367, 373, 379, 383, 389, 419, 431, 439, 443, 463, 467, 479
OFFSET
1,1
COMMENTS
Perhaps the same as A058340, but need proof. - Ray Chandler, May 20 2008
The first member of this sequence not in A058340 is 295937. - Robert Israel, Aug 12 2016
LINKS
MAPLE
filter:= n -> isprime(n) and numtheory:-invphi(numtheory:-phi(n))[2] = 2*n:
select(filter, [seq(i, i=2..1000)]); # Robert Israel, Aug 12 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, May 10 2008
EXTENSIONS
Corrected and extended by Ray Chandler, May 20 2008
STATUS
approved