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A090807 First prime in the earliest chain of n consecutive primes with gaps 2^1, 2^2,...,2^(n-1). 1
3, 5, 1997, 2237, 6824897, 1356705137, 3637803390827 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

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

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. A079014.

Sequence in context: A298094 A012783 A062655 * A138154 A333269 A319598

Adjacent sequences:  A090804 A090805 A090806 * A090808 A090809 A090810

KEYWORD

nonn

AUTHOR

Joseph L. Pe, Feb 12 2004

EXTENSIONS

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

STATUS

approved

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Last modified September 28 19:55 EDT 2021. Contains 347717 sequences. (Running on oeis4.)