OFFSET
1,2
EXAMPLE
n=1, a(1)=1, p(a(1))=p(1)=2 and p-1=1 is divisible by 2^(n-1)=2^0=1; moreover 2 is the smallest. n=10, a(10)=974, the 974th prime is 7681, p(974) - 1 = 7680 = 512.15, is divisible by 2^9 = 512 the quotient is 15 and no such a prime is below 7681. A057775(30) = 12348030977; A057776(30) = 556542914. It means 12348030977 is the 556542914th prime. A057777(30) = 12348030976; when A057777(30) is divided by 2^29, the quotient is 23 = A057778(30).
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Nov 02 2000
STATUS
approved