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A089651 Partial sums of the sequence : a(1)=1, a(1), a(1), a(1), a(1), a(2), a(2), a(2), a(2), a(3), a(3), a(3), a(3), a(4), ...each terms (not a(1)) repeated 4 times. 1

%I

%S 1,2,3,4,5,7,9,11,13,16,19,22,25,29,33,37,41,46,51,56,61,68,75,82,89,

%T 98,107,116,125,136,147,158,169,182,195,208,221,237,253,269,285,304,

%U 323,342,361,383,405,427,449,474,499,524,549,578,607,636,665

%N Partial sums of the sequence : a(1)=1, a(1), a(1), a(1), a(1), a(2), a(2), a(2), a(2), a(3), a(3), a(3), a(3), a(4), ...each terms (not a(1)) repeated 4 times.

%K easy,nonn

%O 1,2

%A _Philippe Deléham_, Jan 02 2004

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Last modified July 12 18:03 EDT 2020. Contains 335666 sequences. (Running on oeis4.)