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

1,2

Comments

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

Links

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

Example

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

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 *)

Prog

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

Crossrefs

Cf. A103118, A102624.

Sequence in context: A089532 A285254 A326227 * A285091 A286485 A363189

Adjacent sequences: A103398 A103399 A103400 * A103402 A103403 A103404

Keyword

base,nonn

Author

Parthasarathy Nambi, Mar 20 2005

Extensions

More terms from Stefan Steinerberger, Feb 12 2006

Status

approved