# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a034780 Showing 1-1 of 1 %I A034780 #14 May 12 2018 11:44:57 %S A034780 7,13,25,27,37,43,45,49,57,67,73,79,84,87,93,97,115,127,139,142,160, %T A034780 163,169,175,177,193,199,205,207,213,234,235,253,255,258,265,267,277, %U A034780 279,295,298 %N A034780 Numbers k such that A034693(k) = 4. %H A034780 R. J. Mathar, Table of n, a(n) for n = 1..656 %t A034780 Position[#, 4] &@ Table[k = 1; While[! PrimeQ[k n + 1], k++]; k, {n, 300}] // Flatten (* _Michael De Vlieger_, Mar 02 2017 *) %Y A034780 Cf. A034693, A034694. %K A034780 nonn %O A034780 1,1 %A A034780 _Labos Elemer_ # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE