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

Author

Joseph L. Pe, Feb 12 2004

Keywords

• nonn
• hard
• more
• changed

Examples

			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.
		

Links

• Index entries for primes, gaps between.

Crossrefs

Cf. A000230.

Essentially the same as A079014.

Extensions

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