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 A116213 (2^(2^(2^n))-1)/(2^(2^n)+1). 0
 1, 3, 3855, 450552876409790643671482431940419874915447411150352389258589821042463539455 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS 2^n+1 divides 2^(2^n)-1 iff n is a power of 2. LINKS FORMULA a(n) = (2^(2^(2^n))-1)/(2^(2^n)+1). a(n) = A051179(2^n)/A000215(n). MATHEMATICA Table[ (2^2^2^n - 1) / (2^2^n + 1), {n, 0, 3} ] CROSSREFS Cf. A000215 = Fermat numbers: 2^(2^n)+1. Cf. A051179 = 2^(2^n)-1. Sequence in context: A226984 A196628 A089895 * A136544 A024048 A094319 Adjacent sequences:  A116210 A116211 A116212 * A116214 A116215 A116216 KEYWORD nonn AUTHOR Alexander Adamchuk, Apr 08 2007 STATUS approved

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Last modified April 26 12:00 EDT 2019. Contains 322472 sequences. (Running on oeis4.)