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 A090956 Numbers in increasing order such that successive sums are squares and successive differences are squarefree. 3
 1, 3, 6, 19, 30, 51, 70, 99, 157, 167, 233, 343, 386, 455, 506, 583, 642, 727, 794, 887, 1138, 1671, 1693, 1788, 1933, 2036, 2453, 2731, 2745, 3031, 3053, 3508, 3717, 4027, 4073, 4391, 4825, 4976, 5225, 5384, 5641, 5808, 6073, 6471, 6754, 6935, 7226, 7903 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(n) > a(n-1), a(n) + a(n-1) is a square, a(n) - a(n-1) is squarefree. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 EXAMPLE 103 follows 93 as 103 - 93 = 10 is squarefree and 93 + 103 = 196 = 14^2. MATHEMATICA <

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Last modified December 9 15:04 EST 2019. Contains 329877 sequences. (Running on oeis4.)