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A248947 Decimal expansion of Sum_{n >= 1} tan(1/n)^2. 7
3, 1, 3, 2, 7, 9, 9, 3, 6, 2, 8, 1, 8, 0, 0, 5, 2, 2, 6, 7, 2, 0, 0, 3, 4, 0, 1, 2, 8, 5, 8, 5, 6, 7, 6, 3, 8, 0, 5, 2, 2, 8, 0, 5, 2, 2, 4, 1, 8, 8, 7, 2, 4, 0, 1, 1, 2, 7, 1, 9, 2, 0, 0, 4, 1, 8, 0, 5, 4, 4, 3, 7, 2, 3, 1, 9, 8, 2, 3, 3, 8, 7, 1, 5, 9, 3, 5, 4, 5, 4, 9, 3, 6, 5, 3, 7, 9, 6, 2, 9, 4, 8, 9, 5, 7 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 1..500

EXAMPLE

3.132799362818005226720034012858567638052280522418872401127192004180544...

MAPLE

evalf(sum((tan(1/n))^2, n=1..infinity), 120); # Vaclav Kotesovec, Oct 20 2014

MATHEMATICA

(* N[Sum[Tan[1/n]^2, {n, 1, Infinity}], 120], yields only 25 correct decimals *)

PROG

(PARI) default(realprecision, 120); sumpos(n=1, (tan(1/n))^2) \\ Vaclav Kotesovec, Oct 20 2014

CROSSREFS

Cf. A248945, A248946, A248948.

Sequence in context: A126324 A035557 A305735 * A133916 A058589 A112164

Adjacent sequences:  A248944 A248945 A248946 * A248948 A248949 A248950

KEYWORD

nonn,easy,cons,changed

AUTHOR

Clark Kimberling, Oct 18 2014

STATUS

approved

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Last modified April 13 12:29 EDT 2021. Contains 342936 sequences. (Running on oeis4.)