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A062368
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Multiplicative with a(p^e) = (e+1)*(e+2)*(4*e+3)/6.
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3
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1, 7, 7, 22, 7, 49, 7, 50, 22, 49, 7, 154, 7, 49, 49, 95, 7, 154, 7, 154, 49, 49, 7, 350, 22, 49, 50, 154, 7, 343, 7, 161, 49, 49, 49, 484, 7, 49, 49, 350, 7, 343, 7, 154, 154, 49, 7, 665, 22, 154, 49, 154, 7, 350, 49, 350, 49, 49, 7, 1078, 7, 49, 154, 252, 49, 343, 7, 154
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) = Sum_{i|n, j|n} tau(i)*tau(j)/tau(gcd(i, j)), where tau(n) = number of divisors of n, cf. A000005.
Also a(n) = Sum_{i|n, j|n} tau(LCM(i, j)).
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CROSSREFS
| Cf. A002412, A060648, A062380.
Sequence in context: A146410 A146466 A146141 * A059772 A114369 A027844
Adjacent sequences: A062365 A062366 A062367 * A062369 A062370 A062371
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KEYWORD
| nonn,mult
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 07 2001
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