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A179512
a(1) = 12, a(n) = prime(a(n-1)) - 2a(n-1).
7
12, 13, 15, 17, 25, 47, 117, 409, 1985, 13269, 116555, 1301043, 17911307, 296651169, 5792367991, 131137897895, 3395020992813, 99343099511585
OFFSET
1,1
MATHEMATICA
NestList[ Prime@# - 2# &, 12, 17]
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Jul 17 2010
STATUS
approved