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Search: id:A072476
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| A072476 |
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Difference between the sum of first n prime numbers and the sum of first n composite numbers. |
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+0
1
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| -2, -5, -8, -10, -9, -8, -5, -1, 6, 17, 28, 44, 63, 82, 104, 131, 163, 196, 233, 272, 312, 357, 405, 458, 517, 579, 642, 707, 772, 840, 921, 1004, 1092, 1181, 1279, 1378, 1481, 1589, 1700, 1816, 1937, 2058, 2187, 2317, 2450, 2584, 2729, 2884, 3042, 3201, 3362, 3527, 3693, 3868, 4048
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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Composite[n_Integer] := FixedPoint[n + PrimePi[ # ] + 1 &, n + PrimePi[n] + 1]; Table[ Sum[ Prime[i] - Composite[i], {i, 1, n}], {n, 1, 55}]
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CROSSREFS
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Cf. A071411.
Adjacent sequences: A072473 A072474 A072475 this_sequence A072477 A072478 A072479
Sequence in context: A088620 A068702 A083724 this_sequence A078345 A080228 A121294
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KEYWORD
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sign
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 20 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 21 2002
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