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A086059
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Sum of first n 7-almost primes.
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0
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128, 320, 608, 928, 1360, 1808, 2288, 2936, 3608, 4312, 5032, 5832, 6664, 7636, 8644, 9700, 10780, 11868, 12988, 14188, 15404, 16652, 18110, 19582, 21094, 22662, 24246, 25866, 27498, 29178, 30938, 32738, 34562, 36418, 38290, 40274, 42274, 44354
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Elements in this sequence can themselves be 7-almost primes. a(1) = 128 = 2^7. Also a 7-Brilliant number. a(2) = 320 = 2^6 * 5. Also a 7-Brilliant number. Does this happen infinitely often? - Jonathan Vos Post (jvospost3(AT)gmail.com), Dec 11 2004
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EXAMPLE
| a(2)=320 because sum of first two 7-almost primes i.e. 128+192 is 320.
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CROSSREFS
| Sequence in context: A172421 A045053 A114804 * A203449 A195090 A135271
Adjacent sequences: A086056 A086057 A086058 * A086060 A086061 A086062
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KEYWORD
| easy,nonn
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AUTHOR
| Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 24 2003
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