A054789 Earliest sequence with a(a(n)) = 9n.

0, 2, 9, 4, 27, 6, 45, 8, 63, 18, 11, 90, 13, 108, 15, 126, 17, 144, 81, 20, 171, 22, 189, 24, 207, 26, 225, 36, 29, 252, 31, 270, 33, 288, 35, 306, 243, 38, 333, 40, 351, 42, 369, 44, 387, 54, 47, 414, 49, 432, 51, 450, 53, 468, 405, 56, 495, 58, 513, 60, 531, 62, 549

Offset

0,2

Links

Table of n, a(n) for n=0..62.

Index entries for sequences of the a(a(n)) = 2n family

Mathematica

a[0] = 0; a[n_] := Which[m = Mod[n, 18]; m == 0, 9*n-81, m == 9, n+9, MemberQ[ {1, 3, 5, 7, 10, 12, 14, 16}, m], n+1, True, 9*n-9]; Table[ a[n], {n, 0, 62}] (* Jean-François Alcover, Sep 24 2012 *)

Crossrefs

Cf. A002516, A002517, A002518, A007379, A008585.

Sequence in context: A171560 A302451 A220416 * A002508 A353242 A249596

Adjacent sequences: A054786 A054787 A054788 * A054790 A054791 A054792

Keyword

nice,nonn

Author

Henry Bottomley, Apr 27 2000

Status

approved