A031886 - OEIS

%I #10 Nov 15 2019 06:28:14

%S 3,9,21,33,63,69,75,111,129,159,189,201,219,231,237,285,303,327,357,

%T 429,483,537,579,615,639,651,723,735,741,777,801,819,927,933,957,975,

%U 993,1053,1101,1179,1197,1245,1281,1365,1455,1491,1497,1563

%N Lucky numbers with size of gaps equal to 4 (lower terms).

%C This is to lucky numbers (A000959) as smaller member p of cousin prime pairs (A023200) is to primes (A000040). - _Jonathan Vos Post_, May 08 2007

%H Amiram Eldar, <a href="/A031886/b031886.txt">Table of n, a(n) for n = 1..10000</a>

%Y Cf. A000959.

%Y Cf. A000040, A023200.

%K nonn

%O 1,1

%A _Patrick De Geest_