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

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

Offset

0,1

Comments

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.

Links

Table of n, a(n) for n=0..11.

Formula

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

Example

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

Crossrefs

Cf. A005849 A128193.

Sequence in context: A108008 A275773 A060363 * A184091 A309487 A206016

Adjacent sequences: A128191 A128192 A128193 * A128195 A128196 A128197

Keyword

easy,nonn

Author

Enoch Haga, Feb 18 2007

Status

approved