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A118103 First differences contain a(n) n's, in order, starting with a(0)=1. 3

%I #6 Feb 27 2019 08:48:55

%S 1,1,2,4,6,9,12,15,18,22,26,30,34,38,42,47,52,57,62,67,72,77,82,87,93,

%T 99,105,111,117,123,129,135,141,147,153,159,166,173,180,187,194,201,

%U 208,215,222,229,236,243,250,257,264,272,280,288,296,304,312,320,328,336

%N First differences contain a(n) n's, in order, starting with a(0)=1.

%C a(261) = 2701 = a(260) + 15 is the first case where a(n) is relatively prime to the difference (a(n)-a(n-1)) when that difference is composite; a(263) = 2731 is the first prime in the sequence with a composite difference.

%H Charlie Neder, <a href="/A118103/b118103.txt">Table of n, a(n) for n = 0..1000</a>

%Y Cf. A001462, A100143, A108104.

%K nonn

%O 0,3

%A _Franklin T. Adams-Watters_, Apr 12 2006

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