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A022953 a(n) = a(n-1) + c(n+1) for n >= 3, a( ) increasing, given a(1)=1, a(2)=7; where c( ) is complement of a( ). 3
1, 7, 12, 18, 26, 35, 45, 56, 69, 83, 98, 114, 131, 150, 170, 191, 213, 236, 260, 285, 312, 340, 369, 399, 430, 462, 495, 529, 565, 602, 640, 679, 719, 760, 802, 845, 889, 935, 982, 1030, 1079, 1129, 1180, 1232, 1285, 1339, 1394, 1451, 1509, 1568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Here "complement" refers to the numbers not in the sequence.

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

MATHEMATICA

Fold[Append[#1, #1[[-1]] + Complement[Range[Max@#1 + 3], #1][[#2 + 1]]] &, {1, 7}, Range[3, 50]] (* Ivan Neretin, Apr 05 2016 *)

CROSSREFS

Essentially same as A005228.

Sequence in context: A142337 A131912 A247159 * A030714 A190036 A061141

Adjacent sequences:  A022950 A022951 A022952 * A022954 A022955 A022956

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 7 12:05 EDT 2021. Contains 343650 sequences. (Running on oeis4.)