A098039 - OEIS

A098039

Numbers p such that p = (prime(n)+ prime(n+3))/2 is prime for prime indices n=2, 3, 5...

7, 23, 37, 47, 73, 809, 1453, 1931, 2621, 3571, 3917, 4793, 7901, 8819, 9467, 10181, 11657, 12421, 12659, 12781, 13229, 14449, 17383, 21739, 22079, 24151, 26501, 28663, 30881, 32749, 33353, 34439, 38083, 38501, 42467, 42703, 43397, 48091

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OFFSET

2,1

LINKS

Table of n, a(n) for n=2..39.

EXAMPLE

prime(7)+ prime(10) = 17+29. 46/2 = 23, the second term in the table.

PROG

(PARI) g(n, m) = forprime(x=1, n, y=(prime(x)+prime(x+m)); if(y%2==0&isprime(y/2), print1(y\2", ")))

CROSSREFS

Sequence in context: A341284 A227421 A098029 * A132237 A227064 A143030

Adjacent sequences: A098036 A098037 A098038 * A098040 A098041 A098042

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Sep 10 2004

STATUS

approved