A101869 Row 2 of A101866.

10, 20, 26, 36, 46, 52, 62, 68, 78, 88, 94, 104, 114, 120, 130, 136, 146, 156, 162, 172, 178, 188, 198, 204, 214, 224, 230, 240, 246, 256, 266, 272, 282, 292, 298, 308, 314, 324, 334, 340, 350, 356, 366, 376, 382, 392, 402, 408, 418, 424, 434, 444, 450, 460, 466, 476, 486

Offset: 1

Author

N. J. A. Sloane, Jan 28 2005

Keywords

• nonn

Links

• Paolo Xausa, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A001622, A101866.

Programs

Mathematica

Array[2*# + 4*Ceiling[#*GoldenRatio] &, 100] (* Paolo Xausa, Mar 20 2024 *)

Formula

a(n) = 2*n + 4*ceiling(n*(1 + sqrt(5))/2). - Paolo Xausa, Mar 20 2024