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A230481
a(n) = prime(prime(2*n)) - prime(2*prime(n)).
2
-2, 4, 12, 24, 30, 56, 52, 78, 84, 82, 108, 88, 126, 144, 126, 162, 150, 204, 210, 210, 248, 242, 234, 348, 266, 268, 320, 362, 380, 394, 304, 396, 340, 480, 378, 420, 466, 486, 476, 464, 498, 578, 476, 566, 592, 678, 600, 456, 524, 660, 714, 742, 768, 756
OFFSET
1,1
COMMENTS
As difference of two odd primes, all terms are even.
LINKS
FORMULA
a(n) = A217622(n) - A230460(n) = 2*A230482(n).
PROG
(PARI) a=n->prime(prime(2*n))-prime(2*prime(n))
CROSSREFS
KEYWORD
sign
AUTHOR
M. F. Hasler, Oct 20 2013
STATUS
approved