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First differences of A247678
1

%I #9 Aug 21 2024 14:39:03

%S 36,36,54,72,18,36,18,36,36,36,18,36,36,18,18,36,36,54,18,18,90,36,54,

%T 18,18,18,36,18,54,18,36,36,18,18,36,36,18,36,36,18,54,18,72,18,36,54,

%U 18,18,36,18,90,18,36,36,18,18,18,18,18,72,18,36,18,36,18,18,18,18,18,18,36,18,18,18,54,18,18,18,18,18,18

%N First differences of A247678

%C All terms have digital root equal to 9.

%H Odimar Fabeny, <a href="/A247898/b247898.txt">Table of n, a(n) for n = 1..10000</a>

%t Differences[Select[Range[13,3000,18],CompositeQ]] (* _Harvey P. Dale_, Aug 21 2024 *)

%Y Cf. A247678.

%K nonn,easy

%O 1,1

%A _Odimar Fabeny_, Sep 26 2014