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A135004 Decimal expansion of 4/e. 2
1, 4, 7, 1, 5, 1, 7, 7, 6, 4, 6, 8, 5, 7, 6, 9, 2, 8, 6, 3, 8, 2, 0, 9, 5, 0, 8, 0, 6, 4, 5, 8, 4, 3, 4, 6, 9, 7, 8, 3, 2, 4, 4, 5, 2, 4, 1, 2, 7, 0, 7, 1, 3, 3, 8, 0, 3, 1, 3, 4, 7, 2, 0, 6, 7, 8, 9, 8, 4, 5, 9, 8, 2, 9, 7, 9, 5, 9, 9, 2, 1, 3, 4, 2, 8, 5, 8, 9, 0, 9, 7, 3, 8, 3, 6, 7, 8, 5, 7, 4, 9, 8, 6, 5, 0, 9, 3, 0, 1, 1, 0, 7, 3, 7, 5, 9, 8, 0, 8, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Leading coefficient of energy difference between the two lowest states of the hydrogen molecular ion (see Holstein-Herring Method link). - Andrea Pinos, Nov 22 2023
LINKS
Shawn Godin, Problem CC35, Crux Mathematicorum, Vol. 38, No. 7 (2012), p. 265; Solution to Problem CC35, ibid., Vol. 39, No. 7 (2013), p. 299.
FORMULA
Equals lim_{n->oo} (((2*n)!/n!)^(1/n))/n (Godin, 2012). - Amiram Eldar, Apr 02 2022
EXAMPLE
1.471517764685769...
MAPLE
Digits:=100: evalf(4/exp(1)); # Wesley Ivan Hurt, Jan 19 2017
MATHEMATICA
RealDigits[4/E, 10, 120][[1]] (* Harvey P. Dale, Mar 06 2012 *)
PROG
(PARI) 4/exp(1) \\ Michel Marcus, Jan 20 2017
CROSSREFS
Cf. A019741 (e/4), A068985 (1/e), A135002 (2/e).
Sequence in context: A011519 A131594 A100402 * A086234 A016490 A244680
KEYWORD
cons,nonn
AUTHOR
Omar E. Pol, Nov 15 2007
EXTENSIONS
More terms from Harvey P. Dale, Mar 06 2012
STATUS
approved

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Last modified March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)