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Search: id:A060389
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| A060389 |
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a(1)=p_1, a(2)=p_1 + p_1*p_2, a(3)=p_1 + p_1*p_2 + p_1*p_2*p_3, ... where p_i is the i-th prime. |
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3
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| 2, 8, 38, 248, 2558, 32588, 543098, 10242788, 233335658, 6703028888, 207263519018, 7628001653828, 311878265181038, 13394639596851068, 628284422185342478, 33217442899375387208, 1955977793053588026278
(list; graph; listen)
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OFFSET
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2,1
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EXAMPLE
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a(4) = 248 because p_1 + p_1*p_2 + p_1*p_2*p_3 + p_1*p_2*p_3*p_4 = 2 + 6 + 30 + 210 = 248.
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MAPLE
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for n from 1 to 30 do printf(`%d, `, sum(product(ithprime(i), i=1..j), j=1..n)) od:
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CROSSREFS
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Sequence in context: A001340 A058786 A096654 this_sequence A101714 A077318 A082014
Adjacent sequences: A060386 A060387 A060388 this_sequence A060390 A060391 A060392
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Apr 04 2001
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Apr 05 2001
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