A084488 Prime(n)+q, where q is the next prime such that q mod 4 = (prime(n)+2) mod 4.

8, 12, 20, 24, 32, 36, 48, 52, 60, 68, 80, 84, 96, 100, 112, 120, 128, 140, 144, 152, 168, 172, 192, 200, 204, 212, 216, 236, 240, 264, 268, 276, 288, 300, 308, 320, 336, 340, 352, 360, 372, 384, 392, 396, 428, 440, 452, 456, 468, 472, 480, 492, 508, 520, 532

Offset

2,1

Links

Table of n, a(n) for n=2..56.

Example

Prime(4) = 7, (7+2) mod 4 = 1, 11 mod 4 = 3, 13 mod 4 = 1, hence a(4) = 7+13 = 20.

Prog

(PARI) {forprime(p=3, 270, m=(p+2)%4; q=nextprime(p+1); while(q%4!=m, q=nextprime(q+1)); print1(p+q, ", "))}

Crossrefs

Cf. A084487.

Sequence in context: A291758 A232867 A358574 * A337877 A211410 A001749

Adjacent sequences: A084485 A084486 A084487 * A084489 A084490 A084491

Keyword

nonn

Author

Jon Perry, May 28 2003

Extensions

Edited and extended by Klaus Brockhaus, May 28 2003

Status

approved