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 A102903 Primes of the form 3^n+4 = 3^n+3+1. 14
 5, 7, 13, 31, 733, 19687, 59053, 31381059613, 205891132094653, 109418989131512359213, 1570042899082081611640534567, 323257909929174534292273980721360271853391 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..17 MATHEMATICA a = Delete[Union[Flatten[Table[If [PrimeQ[3^n + 4] == True, 3^ n + 4, 0], {n, 1, 200}]]], 1] Select[Table[3^n+4, {n, 0, 200}], PrimeQ] (* Vincenzo Librandi, Jul 19 2012 *) PROG (MAGMA) [a: n in [0..100] | IsPrime(a) where a is 3^n+4]; // Vincenzo Librandi, Jul 19 2012 CROSSREFS Cf. A057735. Cf. A058958 (associated n). Cf. primes of the form 3^n + k: A057735 (k=2), this sequence (k=4), A102870 (k=8), A102907 (k=10), A102874 (k=14), A243437 (k=16), A102904 (k=20), A243438 (k=22), A243439 (k=26), A102906 (k=28). Sequence in context: A288889 A168609 A266951 * A294064 A018464 A063446 Adjacent sequences:  A102900 A102901 A102902 * A102904 A102905 A102906 KEYWORD nonn AUTHOR Roger L. Bagula, Mar 01 2005 EXTENSIONS Edited by Zak Seidov, Aug 29 2014 STATUS approved

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Last modified March 20 15:43 EDT 2019. Contains 321345 sequences. (Running on oeis4.)