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1, 4, 8, 9, 15, 27, 35, 36, 37, 55, 67, 71, 85, 109, 133, 134, 152, 155, 175, 181, 213, 249, 273, 277, 278, 320, 321, 329, 359, 431, 463, 464, 512, 566, 614, 615, 653, 713, 769, 775, 817, 913, 957, 969, 975, 1047, 1095, 1099, 1100, 1103, 1175, 1189, 1243
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internal format)
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OFFSET
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1,2
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REFERENCES
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Steven R. Finch, Mathematical Constants II, Encyclopedia of Mathematics and Its Applications, Cambridge University Press, Cambridge, 2018, p. 50.
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LINKS
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FORMULA
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Lim_{n->oo} a(n)/n^2 = 1/2 * Product_{p prime}(1 - 1/(p^2*(p+1))) = 1/2 * A065465.
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MATHEMATICA
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Accumulate[Table[Plus @@ Select[Divisors@ n, Max @@ Last /@ FactorInteger@ # == 1 && GCD[#, n/#] == 1 &], {n, 1, 53}]] (* after Michael De Vlieger at A092261 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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