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A057776 a(n)-th prime is smallest such that p(a[n])-1 is divisible by 2^(n-1) and quotient is odd. 1
1, 2, 3, 13, 7, 25, 44, 116, 55, 974, 1581, 2111, 1470, 4289, 10847, 15000, 6543, 91466, 62947, 397907, 498178, 1452314, 6025010, 20197904, 38946356, 9385401, 24843812, 98842359, 166808880, 556542914, 154570517 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..31.

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

Cf. A000040, A006093, A057773-A057778.

Sequence in context: A087564 A306431 A192362 * A110362 A074478 A046421

Adjacent sequences:  A057773 A057774 A057775 * A057777 A057778 A057779

KEYWORD

nonn

AUTHOR

Labos Elemer, Nov 02 2000

STATUS

approved

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Last modified July 20 01:38 EDT 2019. Contains 325168 sequences. (Running on oeis4.)