A284057 Square numbers of the form prime(k) + 2*prime(k+1).

81, 1521, 9801, 11881, 12321, 20449, 25281, 29241, 32041, 35721, 40401, 53361, 83521, 126025, 168921, 210681, 237169, 245025, 267289, 273529, 290521, 297025, 330625, 370881, 378225, 408321, 423801, 585225, 619369, 635209, 783225, 793881, 893025, 1185921, 1279161

Offset

1,1

Comments

Values of k: {9, 96, 461, 548, 565, 876, 1053, ...}.

Values of prime(k): {23, 503, 3259, 3947, 4099, 6803, 8423, ...}.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Example

81 = prime(9) + 2*prime(10) = 23 + 2*29, 1521 = prime(96) + 2*prime(97) = 503 + 2*509.

Mathematica

Select[Table[Prime[k] + 2*Prime[k + 1], {k, 10000}], Floor[Sqrt[#]]^2 == # &]

Crossrefs

Sequence in context: A110921 A236867 A203650 * A237559 A223279 A096302

Adjacent sequences: A284054 A284055 A284056 * A284058 A284059 A284060

Keyword

nonn

Author

Zak Seidov, Mar 19 2017

Extensions

More terms from Chai Wah Wu, Mar 20 2017

Status

approved