

A102723


Smallest prime a(n) such that a(n)x and a(n)+x, for x=1 to n, are all composite.


1



5, 23, 23, 53, 53, 211, 211, 211, 211, 211, 211, 1847, 1847, 2179, 2179, 2179, 2179, 3967, 3967, 16033, 16033, 16033, 16033, 24281, 24281, 24281, 24281, 24281, 24281, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 38501, 58831
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OFFSET

1,1


COMMENTS

a(2n+1)=a(2n).  Robert G. Wilson v, Feb 22 2005


LINKS

Table of n, a(n) for n=1..40.


MATHEMATICA

f[n_] := Block[{k = 1}, While[ Union[ PrimeQ /@ Sort[ Flatten[ Table[{Prime[k]  i, Prime[k] + i}, {i, n}]]]] != {False}, k++ ]; Prime[k]]; Table[ f[n], {n, 40}] (from Robert G. Wilson v Feb 22 2005)


CROSSREFS

Cf. A023186.
Sequence in context: A177242 A233756 A002582 * A136146 A167804 A196243
Adjacent sequences: A102720 A102721 A102722 * A102724 A102725 A102726


KEYWORD

nonn


AUTHOR

Ray G. Opao, Feb 06 2005


EXTENSIONS

a(12)a(40) from Robert G. Wilson v, Feb 22 2005


STATUS

approved



