A217499 Primes of the form 2*n^2 + 70*n + 33.

181, 433, 1801, 4933, 5581, 7741, 13033, 18433, 24733, 41761, 47161, 49033, 94033, 96661, 104761, 140401, 156781, 174061, 188533, 207433, 227233, 252181, 265141, 370081, 385741, 412561, 423541, 440281, 451621, 510481, 535033, 572941, 598933, 659521, 666433

Offset: 1

Author

Vincenzo Librandi, Oct 09 2012

Keywords

• nonn
• easy

Comments

Conjecture: 2^a(n)-1 is not prime; in other words, these primes are included in A054723.

2*a(n) + 1159 is a square. - Vincenzo Librandi, Apr 10 2015

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..3000

Crossrefs

Cf. A054723, A176549, A217494.

Subsequence of A002144.

Programs

Magma

[a: n in [1..600] | IsPrime(a) where a is 2*n^2+70*n+33];

Mathematica

Select[Table[2 n^2 + 70 n + 33, {n, 600}], PrimeQ]