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A093827 Decimal expansion of Silverman's constant. 2
1, 7, 8, 6, 5, 7, 6, 4, 5, 9, 3, 6, 5, 9, 2, 2, 4, 6, 3, 4, 5, 8, 5, 9, 0, 4, 7, 5, 5, 4, 1, 3, 1, 5, 7, 5, 0, 3, 1, 2, 6, 2, 1, 9, 0, 2, 3, 8, 4, 2, 4, 3, 2, 9, 4, 9, 0, 1, 0, 7, 2, 4, 9, 6, 2, 1, 4, 2, 4, 5, 2, 7, 9, 1, 3, 4, 7, 8, 6, 2, 2, 3, 7, 7, 3, 2, 6, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..88.

Eric Weisstein's World of Mathematics, Silverman Constant

EXAMPLE

1.78657645...

MAPLE

read("transforms") ; Digits := 140 ; kmax := 450 ; tmax := kmax-10 ; 1+add(1/(p^(2*k)-p^(k-1)), k=1..kmax) : xt := subs(p=1/x, %) : xt := taylor(xt, x=0, tmax) ; L := [] ; for n from 1 to tmax-1 do L := [op(L), coeftayl(xt, x=0, n)]; end do: Le := EULERi(L) ; x := 1.0 ; for i from 2 to nops(Le) do x := x*Zeta(i)^op(i, Le) ; x := evalf(x) ; print(x) ; end do: # R. J. Mathar, Jul 28 2010

MATHEMATICA

Sum[1/(EulerPhi[n]DivisorSigma[1, n]), {n, Infinity}]

CROSSREFS

Sequence in context: A143300 A303985 A242816 * A245736 A088660 A244263

Adjacent sequences:  A093824 A093825 A093826 * A093828 A093829 A093830

KEYWORD

nonn,cons

AUTHOR

Eric W. Weisstein, Apr 16 2004

EXTENSIONS

37 more digits from R. J. Mathar, Jul 28 2010

STATUS

approved

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Last modified October 22 19:53 EDT 2019. Contains 328319 sequences. (Running on oeis4.)