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A092894 Decimal expansion of Frederick Magata's constant. 6
3, 4, 0, 7, 0, 6, 9, 1, 6, 5, 6, 2, 7, 2, 5, 6, 1, 4, 2, 2, 1, 9, 4, 5, 8, 2, 6, 2, 8, 2, 7, 1, 8, 0, 6, 5, 3, 5, 5, 4, 0, 3, 4, 4, 3, 8, 0, 1, 5, 0, 3, 2, 1, 1, 6, 1, 9, 1, 0, 3, 3, 8, 2, 7, 5, 7, 2, 9, 6, 9, 9, 3, 8, 7, 0, 4, 1, 0, 3, 5, 1, 4, 3, 0, 0, 9, 9, 0, 0, 4, 0, 9, 3, 8, 9, 4, 7, 4, 1, 0, 8, 7, 8, 7, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Starting with the data (1,2), (2,3), (3,5), (4,7), (5,11), (6,13), ..., (n,p_n) where p_n is the n-th prime number, Frederick Magata (1998) used Newtonian interpolation to determine the coefficients b_k of a (n-1) degree polynomial fit b_0 + b_1*(x-1) + b_2*(x-1)*(x-2) + b_3*(x-1)*(x-2)*(x-3) + ... The sum of all the coefficients b_k, for arbitrarily large n, appears to converge to 3.407069...

Although it takes only 86 terms to secure the decimal representation above, Robert G. Wilson v took it out to 1000 terms.

LINKS

Table of n, a(n) for n=1..105.

S. R. Finch, Magata's constant.

EXAMPLE

FM = 3.407069165627256142219458262827180653554034438015032116191033...

MATHEMATICA

n := 100; P[y_] := P[y] = InterpolatingPolynomial[ Array[ Prime, n], x] /. x->y; fm = N[ Sum[ Level[ P[y], {2*k-1}] [[1]], {k, 1, n-1}] + Level[ P[y], {2*n-2}] [[1]], 111]; RealDigits[fm][[1]] (* Steven Finch *)

CROSSREFS

Sequence in context: A110665 A063441 A319600 * A276563 A011338 A214024

Adjacent sequences:  A092891 A092892 A092893 * A092895 A092896 A092897

KEYWORD

cons,nonn

AUTHOR

Robert G. Wilson v, Mar 10 2004

STATUS

approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)