A201709 Primes of the form 10n^2 + 1.

11, 41, 251, 491, 641, 811, 2251, 4001, 6761, 7841, 9001, 10891, 12251, 13691, 16001, 16811, 22091, 23041, 32491, 33641, 40961, 50411, 68891, 72251, 73961, 81001, 82811, 86491, 98011, 108161, 110251, 112361, 121001, 125441, 127691

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Mathematica

Select[Table[10n^2+1, {n, 0, 800}], PrimeQ]

Prog

(Magma) [a: n in [0..300] | IsPrime(a) where a is 10*n^2+1];

Crossrefs

Sequence in context: A260270 A118572 A333084 * A092445 A068840 A082424

Adjacent sequences: A201706 A201707 A201708 * A201710 A201711 A201712

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 04 2011

Status

approved