# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a102545 Showing 1-1 of 1 %I A102545 #11 Sep 08 2022 08:45:16 %S A102545 2,4,16,19,20,23,29,40,43,50,59,62,71,83,89,107,115,116,122,134,145, %T A102545 155,157,160,167,184,197,218,250,251,262,268,278,284,289,292,298,311, %U A102545 314,335,344,346,347,349,353,355,361,362,379,389,398,400,401,425,431,437,439,452,457,470,475,485,491 %N A102545 Numbers k such that k999999 is prime. %e A102545 If k=2, then k999999 = 2999999 (prime). %e A102545 If k=43, then k999999 = 43999999 (prime). %e A102545 If k=89, then k999999 = 89999999 (prime). %o A102545 (Magma) [ n: n in [1..700] | IsPrime(Seqint([9,9,9,9,9,9] cat Intseq(n))) ]; // _Vincenzo Librandi_, Feb 04 2011 %K A102545 base,nonn %O A102545 1,1 %A A102545 _Parthasarathy Nambi_, Feb 24 2005 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE