A090807 First prime in the earliest chain of n consecutive primes with gaps 2^1, 2^2, ..., 2^(n-1).

3, 5, 1997, 2237, 6824897, 1356705137, 3637803390827

Offset

2,1

Links

Table of n, a(n) for n=2..8.

Index entries for primes, gaps between.

Example

The earliest chain of 4 consecutive primes separated by gaps 2^1, 2^2, 2^3 is: 1997, 1999, 2003, 2011. Hence a(4) = 1997.

Crossrefs

Cf. A000230, A079014.

Sequence in context: A062655 A364547 A368462 * A364551 A138154 A333269

Adjacent sequences: A090804 A090805 A090806 * A090808 A090809 A090810

Keyword

nonn,hard,more

Author

Joseph L. Pe, Feb 12 2004

Extensions

a(7)-a(8) from Donovan Johnson, Mar 23 2013

Status

approved