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A136022
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First differences of A136021.
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1
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19, 1028, 63326, 4417267, 336418691, 27095099730, 2264740360646, 194526458511192, 17050085068702458, 1517704371492095702, 136758640772944755122, 12445444666179480674989, 1141852084948606732236114, 105483948921834512942168239
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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a(1)=19 because at 10^0 the prime divisor sum in A136021 is zero, so 19-0=19. From the second sum in A136021, 1047, subtract 19, so that a(2) = 1028.
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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EXTENSIONS
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a(6) from R. J. Mathar, Dec 12 2007
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STATUS
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approved
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