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Search: id:A039928
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| A039928 |
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Sum of first n terms of A_n (using absolute values of terms). |
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+0
3
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| 1, 3, 3, 0, 10, 12, 1, 24, 25, 32, 116, 12, 412, 109, 126, 2389, 12497, 28772, 126, 72795, 247786, 770213, 159378001963452599318, 2169128, 442, 311, 378, 789, 10015050, 75, 74253544, 7881195, 2461717833658872781238383813854943728
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Since the sequences in the OEIS occasionally change their initial terms (for editorial reasons), this is an especially ill-defined sequence! - N. J. A. Sloane (njas(AT)research.att.com), Jan 01 2005
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EXAMPLE
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A000001 (Number of groups of order n) begins 1,... -> a(1)= 1
A000002 (Kolakoski sequence) begins 1,2,... -> a(2)= 3
A000003 begins 1,1,1,... -> a(3)= 3
A000004 (The zero sequence) begins 0,0,0,0,... -> a(4)= 0
A000005 (The number of divisors) begins 1,2,2,3,2,... -> a(5)=10
A000009 begins 1,1,2,2,4,2,6,4,6,... so a(9) = 1+1+2+2+4+2+6+4+6 = 28.
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CROSSREFS
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Cf. A031135, A031214, A100543 (uses signed values).
Sequence in context: A093755 A120981 A100543 this_sequence A137259 A111843 A119537
Adjacent sequences: A039925 A039926 A039927 this_sequence A039929 A039930 A039931
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KEYWORD
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dumb,easy,nonn
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AUTHOR
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Russ Cox (rsc(AT)swtch.com)
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EXTENSIONS
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Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 27 2004
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