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A181852 a(n) = A057641(A094348(n)). 1
0, 0, 0, 0, 0, 1, 6, 9, 2, 14, 6, 23, 33, 34, 78, 114, 105, 227, 281, 207, 492, 1536, 1667, 3036, 5155, 6502, 5206, 7682, 15861, 15396, 9051, 21295, 22160, 36300, 58657, 71186, 81276, 91901 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..38.

Peter Luschny, More terms, OEIS wiki.

EXAMPLE

Example: The ninth member of A094348 is 60 because lcm(1,2,3,4,5) = 60. Let H(n) = Sum_{k=1..n} 1/k. Since H(60) + exp(H(60)) log(H(60)) = 170.9766843.. and sigma(60) = 1 + 2 + 3 + 4 + 5 + 6 + 10 + 12 + 15 + 20 + 30 + 60 = 168 it follows A181852(9)= 170 - 168 = 2.

Further, the inequality 0 <= A057641(lcm(1,2,3,4,5)) is in agreement with (Lagarias' formulation of) the Riemann hypothesis.

CROSSREFS

Cf. A057641, A094348.

Sequence in context: A254292 A188618 A225125 * A129938 A022698 A013707

Adjacent sequences:  A181849 A181850 A181851 * A181853 A181854 A181855

KEYWORD

nonn

AUTHOR

Peter Luschny, Dec 11 2010

STATUS

approved

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Last modified September 18 03:09 EDT 2021. Contains 347504 sequences. (Running on oeis4.)