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A187779 Numbers n for which the terms of A014320 up to n=A014320(k) are a permutation of {1,2,4,6,...,2*(k-1)} 1
1, 2, 4, 6, 8, 12, 32, 36, 150 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

An old conjecture states that the equation prime(n+1)-prime(n)=2m is solvable for m=1/2,1,2,...  . a(n) indicate the smallest term of A014320 such that among the previous terms there occur 1 and all previous even numbers<=a(n). The primes up to 10^8 do not generate any further terms.

According to T. R. Nicely (see Links) the next term, if it exists, must be greater than 1344 and equal to a gap occurring between primes greater than 4*10^18. - Giovanni Resta, Jan 06 2013

LINKS

Table of n, a(n) for n=1..9.

Thomas R. Nicely,First occurrence prime gaps

CROSSREFS

Essentially equivalent to A179985.

Sequence in context: A063008 A059901 A136101 * A086141 A067883 A283769

Adjacent sequences:  A187776 A187777 A187778 * A187780 A187781 A187782

KEYWORD

nonn

AUTHOR

Peter J. C. Moses, Jan 05 2013

EXTENSIONS

Definition corrected by Giovanni Resta, Jan 05 2013

STATUS

approved

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Last modified February 20 06:45 EST 2018. Contains 299358 sequences. (Running on oeis4.)