A108341 Numbers n such that 997*n - 1009 is prime.

6, 8, 18, 30, 36, 38, 44, 66, 78, 90, 98, 104, 116, 134, 140, 144, 156, 164, 168, 170, 200, 228, 230, 246, 248, 260, 276, 296, 318, 344, 354, 374, 378, 380, 386, 408, 420, 426, 450, 464, 468, 480, 500, 510, 546, 576, 578, 584, 606, 608, 618, 620, 630, 654, 678

Offset: 1

Author

Parthasarathy Nambi, Jun 30 2005

Keywords

• nonn
• easy

Comments

997 and 1009 are primes.

All terms are even. - Harvey P. Dale, Mar 09 2019

Examples

			If n=6, then 997*n - 1009 = 4973 (prime).
If n=90, then 997*n - 1009 = 88721 (prime).
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A101086.

Programs

Maple

a:=proc(n) if isprime(997*n-1009)=true then n else fi end: seq(a(n),n=1..750); # Emeric Deutsch, Jul 04 2005

Mathematica

Select[Range[2,700,2],PrimeQ[997#-1009]&] (* Harvey P. Dale, Mar 09 2019 *)

PARI

is(n)=isprime(997*n-1009) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

More terms from Emeric Deutsch, Jul 04 2005