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Search: id:A097557
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| A097557 |
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a(n+1) = a(n) + number of nonprimes so far; a(1) = 1. |
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+0
1
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| 1, 2, 3, 4, 6, 9, 13, 17, 21, 26, 32, 39, 47, 55, 64, 74, 85, 97, 109, 121, 134, 148, 163, 178, 194, 211, 228, 246, 265, 285, 306, 328, 351, 375, 400, 426, 453, 481, 510, 540, 571, 602, 634, 667, 701, 735, 770, 806, 843, 881, 919, 957, 996, 1036, 1077, 1119
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(2) = a(1) + #{1} = 1 + 1 = 2;
a(3) = a(2) + #{1} = 2 + 1 = 3;
a(4) = a(3) + #{1} = 3 + 1 = 4;
a(5) = a(4) + #{1,4} = 4 + 2 = 6;
a(6) = a(5) + #{1,4,6} = 6 + 3 = 9;
a(7) = a(6) + #{1,4,6,9} = 9 + 4 = 13;
a(8) = a(7) + #{1,4,6,9} = 13 + 4 = 17;
a(9) = a(8) + #{1,4,6,9} = 17 + 4 = 21;
a(10) = a(9) + #{1,4,6,9,21} = 21 + 5 = 26.
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CROSSREFS
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Sequence in context: A057287 A056751 A137446 this_sequence A123648 A129632 A016028
Adjacent sequences: A097554 A097555 A097556 this_sequence A097558 A097559 A097560
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 27 2004
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