A084488 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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