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 A128194 Absolute value of second differences of values of n for Cullen primes in A005849. 1

%I

%S 4432,3490,266,11069,1911,13619,27010,3982,31169,72698,21768,752305

%N Absolute value of second differences of values of n for Cullen primes in A005849.

%C In this sequence a(3) and a(5) are primes. Also a(1)+1, a(6)+1 and a(7)+1 are primes. And a(10)-1 is prime. These may at some future time begin three new sequences.

%F Find the absolute value of second differences of overlapping pairs of values of n

%e a(0)=4432 because the first two values of first differences in A128193 are 140 and 4572. 4572-140=4432, the first second difference.

%Y Cf. A005849 A128193.

%K easy,nonn

%O 0,1

%A _Enoch Haga_, Feb 18 2007

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Last modified June 18 17:18 EDT 2021. Contains 345120 sequences. (Running on oeis4.)