A113568 - OEIS

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A113568

Numbers k such that prime(k) +- k, prime(k) +- 2k, prime(k) +- 3k and prime(k) +- 4k are all primes.

2053380, 794006430, 1659273630

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..3.

MATHEMATICA

t = {}; p = 2*3*5*7; Do[ If[ PrimeQ[Prime[p*n] - p*3n] && PrimeQ[Prime[p*n] - p*2n] && PrimeQ[Prime[p*n] - p*n] && PrimeQ[Prime[p*n] + p*n] && PrimeQ[Prime[p*n] + p*2n] && PrimeQ[Prime[p*n] + p*3n], AppendTo[t, n]], {n, 17 106}]; p*t

CROSSREFS

Cf. A064403, A112530, A113567.

Sequence in context: A034639 A206667 A251512 * A186915 A186907 A186906

Adjacent sequences: A113565 A113566 A113567 * A113569 A113570 A113571

KEYWORD

bref,nonn,more

AUTHOR

Robert G. Wilson v, Sep 20 2005

STATUS

approved