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Search: id:A137601
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| A137601 |
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a(n) is the smallest number m such that pi(m)+sigma(m)=n*m. |
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+0
1
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OFFSET
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1,2
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COMMENT
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Next term is greater than 135*10^7.
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EXAMPLE
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a(3)=3902496 because pi(3902496)+sigma(3902496)=3*3902496 and 3902496 is the smallest such number.
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CROSSREFS
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Sequence in context: A124368 A037051 A071066 this_sequence A158347 A133495 A157991
Adjacent sequences: A137598 A137599 A137600 this_sequence A137602 A137603 A137604
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KEYWORD
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hard,more,nonn,less,bref
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Apr 11 2008
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