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 A246392 Numbers n such that Phi(10, n) is prime, where Phi is the cyclotomic polynomial. 40
 2, 3, 5, 10, 11, 12, 16, 20, 21, 22, 33, 37, 38, 43, 47, 48, 55, 71, 75, 76, 80, 81, 111, 121, 126, 131, 133, 135, 136, 141, 155, 157, 158, 165, 176, 177, 180, 203, 223, 242, 245, 251, 253, 256, 257, 258, 265, 268, 276, 286, 290, 297, 307, 322, 323, 342, 361, 363, 366, 375, 377, 385, 388, 396, 411 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers n such that (n^5+1)/(n+1) is prime, or numbers n such that A060884(n) is prime. LINKS Robert Price, Table of n, a(n) for n = 1..893 OEIS Wiki, Cyclotomic Polynomials at x=sigma(n) MAPLE A246392:=n->`if`(isprime((n^5+1)/(n+1)), n, NULL): seq(A246392(n), n=1..500); # Wesley Ivan Hurt, Nov 15 2014 MATHEMATICA Select[Range[700], PrimeQ[(#^5 + 1) / (# + 1)] &] (* Vincenzo Librandi, Nov 14 2014 *) PROG (PARI) for(n=1, 10^3, if(isprime(polcyclo(10, n)), print1(n, ", "))); \\ Joerg Arndt, Nov 13 2014 (MAGMA) [n: n in [1..500]| IsPrime((n^5+1) div (n+1))]; // Vincenzo Librandi, Nov 14 2014 CROSSREFS Cf. A008864 (1), A006093 (2), A002384 (3), A005574 (4), A049409 (5), A055494 (6), A100330 (7), A000068 (8), A153439 (9), this sequence (10), A162862 (11), A246397 (12), A217070 (13), A006314 (16), A217071 (17), A164989 (18), A217072 (19), A217073 (23), A153440 (27), A217074 (29), A217075 (31), A006313 (32), A097475 (36), A217076 (37), A217077 (41), A217078 (43), A217079 (47), A217080 (53), A217081 (59), A217082 (61), A006315 (64), A217083 (67), A217084 (71), A217085 (73), A217086 (79), A153441 (81), A217087 (83), A217088 (89), A217089 (97), A006316 (128), A153442 (243), A056994 (256), A056995 (512), A057465 (1024), A057002 (2048), A088361 (4096), A088362 (8192), A226528 (16384), A226529 (32768), A226530 (65536). Cf. A060884, A085398. Sequence in context: A094542 A175481 A288244 * A219860 A076681 A047604 Adjacent sequences:  A246389 A246390 A246391 * A246393 A246394 A246395 KEYWORD nonn AUTHOR Eric Chen, Nov 13 2014 STATUS approved

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Last modified July 28 09:10 EDT 2021. Contains 346322 sequences. (Running on oeis4.)