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A117696
Primes in sequence a(1)=2, a(n+1)=2^a(n)-3^(n-1).
0
2, 3, 5, 23, 8388581
OFFSET
1,1
FORMULA
a(1)=2, a(n+1)=2^a(n)-3^(n-1)
EXAMPLE
a(1)=2, a(2)=2^a(1)-3^0=2^2-3^0=3
CROSSREFS
Cf. A075883.
Sequence in context: A053708 A137070 A084730 * A256463 A279864 A324289
KEYWORD
hard,nonn
AUTHOR
Parviz Afereidoon (afereidoon(AT)gmail.com), Apr 13 2006
STATUS
approved