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 A036248 Denominator of fraction equal to the continued fraction [ 2, 3, 5, ..., prime(n) ]. 5
 1, 3, 16, 115, 1281, 16768, 286337, 5457171, 125801270, 3653694001, 113390315301, 4199095360138, 172276300080959, 7412079998841375, 348540036245625584, 18480034001016997327, 1090670546096248467877, 66549383345872173537824 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..18. FORMULA a(1) = 1, a(2) = 3, a(n) = A000040(n) * a(n-1) + a(n-2). - Daniel Suteu, Dec 20 2016 EXAMPLE Prime(4) = 7, and 2+1/(3+1/(5+1/7)) = 266/115, so a(4) = 115. - Jon E. Schoenfield, Dec 20 2016 PROG (PARI) a(n)=if(n<0, 0, contfracpnqn(vector(n, i, prime(i)))[2, 1]) CROSSREFS Cf. A036247. Sequence in context: A177402 A036244 A011818 * A111555 A336293 A355718 Adjacent sequences: A036245 A036246 A036247 * A036249 A036250 A036251 KEYWORD frac,easy,nonn AUTHOR Jeff Burch EXTENSIONS More terms from Benoit Cloitre, May 25 2003 STATUS approved

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Last modified November 29 13:49 EST 2023. Contains 367445 sequences. (Running on oeis4.)