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Search: id:A091306
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| A091306 |
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Sum of squares of unitary, square-free divisors of n, including 1. |
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+0
1
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| 1, 5, 10, 1, 26, 50, 50, 1, 1, 130, 122, 10, 170, 250, 260, 1, 290, 5, 362, 26, 500, 610, 530, 10, 1, 850, 1, 50, 842, 1300, 962, 1, 1220, 1450, 1300, 1, 1370, 1810, 1700, 26, 1682, 2500, 1850, 122, 26, 2650, 2210, 10, 1, 5, 2900, 170, 2810, 5, 3172, 50, 3620
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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If b(n,k) = sum of k-th powers of unitary, square-free divisors of n, including 1, then b(n,k) is multiplicative with b(p,k)=p^k+1 and b(p^e,k)=1 for e>1.
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FORMULA
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Multiplicative with a(p)=p^2+1 and a(p^e)=1 for e>1.
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CROSSREFS
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Cf. A056671, A092261.
Sequence in context: A098135 A112259 A099731 this_sequence A073048 A102258 A084341
Adjacent sequences: A091303 A091304 A091305 this_sequence A091307 A091308 A091309
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KEYWORD
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mult,easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 23 2004
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