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 A177799 Primes of the form prime(prime(n)) mod prime(n), sorted by increasing n. 0
 2, 3, 2, 3, 19, 23, 29, 41, 2, 7, 13, 19, 23, 31, 71, 71, 73, 73, 79, 109, 137, 149, 197, 197, 257, 263, 263, 311, 349, 349, 337, 349, 383, 383, 421, 433, 23, 29, 23, 19, 17, 31, 71, 131, 139, 223, 263, 293, 293, 521, 557, 593, 613, 631, 823, 911, 919, 919, 947, 1109, 1427, 1487, 1483, 1613, 1693, 1913, 2131, 2203, 2381, 2659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This scans A004648(A000040(.)) = 1, 2, 1, 3, 9, 2, 8, 10,... , and discards composites. LINKS EXAMPLE a(1)=2 because (prime(prime(2))=5 mod prime(2)=3)=2=prime. PROG (PARI) s=[]; for(n=1, 3000, p=prime(prime(n))%prime(n); if(isprime(p), s=concat(s, p))); s \\ Colin Barker, Jun 28 2014 CROSSREFS Cf. A000040, A004648. Sequence in context: A224416 A282049 A038700 * A125767 A326991 A131580 Adjacent sequences:  A177796 A177797 A177798 * A177800 A177801 A177802 KEYWORD nonn,less AUTHOR Juri-Stepan Gerasimov, Dec 12 2010 EXTENSIONS Terms corrected by R. J. Mathar, Dec 17 2010 STATUS approved

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Last modified July 28 08:44 EDT 2021. Contains 346321 sequences. (Running on oeis4.)