A103401 Numbers k such that k211 is prime.

0, 4, 6, 7, 10, 12, 18, 19, 21, 27, 28, 30, 33, 34, 49, 58, 61, 63, 67, 72, 75, 84, 87, 88, 96, 105, 108, 109, 111, 115, 118, 126, 130, 135, 142, 147, 150, 154, 157, 163, 165, 168, 175, 177, 180, 181, 184, 186, 187, 199, 201, 205, 214, 216, 223, 228, 234, 235, 249, 256, 258, 259, 264, 268, 271, 279

Offset: 1

Author

Parthasarathy Nambi, Mar 20 2005

Keywords

• base
• nonn

Comments

Also numbers k such that 1000*k+211 is prime. - Stefan Steinerberger, Feb 12 2006

Examples

			If k=27, then k211 = 27211 (prime).
If k=72, then k211 = 72211 (prime).
		

Links

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

Crossrefs

Cf. A103118, A102624.

Programs

Magma

[ n: n in [0..700] | IsPrime(Seqint([1, 1, 2] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 03 2011

Mathematica

For[n = 0, n < 220, n++, If[PrimeQ[1000*n + 211], Print[n]]] (* Stefan Steinerberger, Feb 12 2006 *)
Select[Range[0,300],PrimeQ[1000#+211]&] (* Harvey P. Dale, Dec 14 2021 *)

Extensions

More terms from Stefan Steinerberger, Feb 12 2006