A226497 The number of primes of the form i^2+j^4 (A028916) <= 10^n.

2, 6, 28, 121, 583, 2724, 13175, 64551, 322110, 1621929, 8254127

Offset

1,1

Comments

Even if a prime has more than one representation in the form i^2+j^4, it is only counted once.

Iwaniec and Friedlander have proved there is infinity of the primes of the form i^2+j^4.

Links

Table of n, a(n) for n=1..11.

Mathematica

mx = 2^40; lst = {};  Do[a = i^2 + j^4; If[ PrimeQ[a], AppendTo[lst, a]], {i, Sqrt[mx]}, {j, Sqrt[Sqrt[mx - i^2]]}]; Table[ Length@ Select[ Union@ lst, # < 10^n &], {n, 12}]

Crossrefs

Cf. A028916, A226495, A226496 & A226498.

Sequence in context: A089748 A047125 A189238 * A307523 A065577 A227294

Adjacent sequences: A226494 A226495 A226496 * A226498 A226499 A226500

Keyword

nonn

Author

Marek Wolf) and Robert G. Wilson v, Jun 09 2013

Status

approved