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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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified August 5 06:16 EDT 2024. Contains 374935 sequences. (Running on oeis4.)