A097532 Least k such that k*P(n)#-P(n+8) and k*P(n)#+P(n+8) are both primes with P(i)=i-th prime and P(i)#=i-th primorial.

15, 7, 4, 2, 1, 2, 2, 33, 9, 29, 3, 4, 19, 30, 21, 138, 22, 32, 110, 56, 43, 18, 274, 184, 10, 105, 50, 16, 75, 299, 5, 303, 290, 254, 131, 146, 78, 73, 15, 54, 581, 304, 41, 13, 93, 1032, 616, 327, 821, 595, 770, 131, 437, 307, 70, 761, 761, 2630, 158, 604, 656, 1006

Offset

1,1

Links

Table of n, a(n) for n=1..62.

Mathematica

Primorial[n_] := Product[ Prime[i], {i, n}]; f[n_] := Block[{k = 1, p = Primorial[n], q = Prime[n + 8]}, While[k*p - q < 2 || !PrimeQ[k*p - q] || !PrimeQ[k*p + q], k++ ]; k]; Table[ f[n], {n, 62}] (* Robert G. Wilson v, Aug 31 2004 *)

Crossrefs

Sequence in context: A241440 A040213 A362409 * A033335 A263400 A240909

Adjacent sequences: A097529 A097530 A097531 * A097533 A097534 A097535

Keyword

easy,nonn

Author

Pierre CAMI, Aug 27 2004

Extensions

More terms from Robert G. Wilson v, Aug 31 2004

Status

approved