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A284057
Square numbers of the form prime(k) + 2*prime(k+1).
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, ...}.
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
KEYWORD
nonn
AUTHOR
Zak Seidov, Mar 19 2017
EXTENSIONS
More terms from Chai Wah Wu, Mar 20 2017
STATUS
approved