

A056784


First nonprime in a sequence of consecutive nonprimes which is at least twice as long as any earlier run of consecutive nonprimes in this list.


1




OFFSET

1,2


LINKS

Table of n, a(n) for n=1..10.
Thomas R. Nicely, First occurrence of prime gaps


EXAMPLE

2300942550 is the first of 319 consecutive composite numbers.
2614941710600 is the first of 651 consecutive composite numbers.
352521223451364324 is the first of 1327 consecutive composite numbers.


CROSSREFS

Cf. A008950, A008995, A008996, A114100, A002386.
Sequence in context: A077192 A128304 A247728 * A166769 A187667 A092956
Adjacent sequences: A056781 A056782 A056783 * A056785 A056786 A056787


KEYWORD

nonn


AUTHOR

Frank James Michael Richards, Jun 19 2001


EXTENSIONS

Corrected by R. J. Mathar, Sep 29 2006
Three more terms from Donovan Johnson, Jan 28 2008


STATUS

approved



