This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A067199 #16 Sep 19 2019 19:49:13
%S A067199 2136,2211,4071,5106,5430,9000,10656,17655,18315,20220,20805,21381,
%T A067199 22356,22920,23025,29616,37050,39261,45795,49920,55686,60435,62205,
%U A067199 64380,79356,81345,91455,94800,95910,96285,105336,108585,111885,118626
%N A067199 Integers k such that k*28*c + 1 is prime for c = 1, 2, 4, 7 and 14.
%C A067199 The product of the 5 primes is a Carmichael number. 28=1+2+4+7+14.
%D A067199 H. Davenport, The Higher Arithmetic. Cambridge Univ. Press, 7th ed., 1999, exercise 8.4.
%H A067199 Amiram Eldar, <a href="/A067199/b067199.txt">Table of n, a(n) for n = 1..10000</a>
%e A067199 2136 results in Carmichael number 599966117492747584686619009.
%t A067199 aQ[n_] := AllTrue[{1, 2, 4, 7, 14}, PrimeQ[28 * n * # + 1] &]; Select[Range[10^5], aQ] (* _Amiram Eldar_, Sep 19 2019 *)
%Y A067199 Cf. A002997, A046025 (based on 6 instead of 28, exercise 8.3 in Davenport), A112428.
%K A067199 nonn,easy
%O A067199 1,1
%A A067199 _Frank Ellermann_, Feb 19 2002
%E A067199 Offset corrected by _Amiram Eldar_, Sep 19 2019