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 A127601 Integer part of 4th root of product of first n primes. 5
 1, 1, 1, 2, 3, 6, 13, 26, 55, 122, 283, 669, 1650, 4176, 10694, 28002, 75555, 209402, 585212, 1674296, 4860120, 14206194, 42353033, 127836257, 392646335, 1232237672, 3906383039, 12444691408, 40024883480, 129326254765 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS For n>=6, a(n) >= prime(n+1). a(n) gives the number of pairs within A002110(n) of the form {x, x^4} where x is nonzero positive integer. - Soumyadeep Dhar, May 16 2021 LINKS Soumyadeep Dhar, Table of n, a(n) for n = 0..1154 MATHEMATICA a = {}; Do[b = 1; Do[b = b Prime[x], {x, 1, n}]; AppendTo[a, Floor[b^(1/4)]], {n, 1, 50}]; a PROG (PARI) a(n)={sqrtnint(vecprod(primes(n)), 4)} \\ Andrew Howroyd, Apr 27 2021 CROSSREFS Cf. A002110, A060797, A127600, A127602, A127603, A127604. Sequence in context: A293315 A052702 A058766 * A030038 A030040 A274493 Adjacent sequences: A127598 A127599 A127600 * A127602 A127603 A127604 KEYWORD nonn AUTHOR Artur Jasinski, Jan 19 2007 EXTENSIONS a(0)=1 prepended by Soumyadeep Dhar, Apr 28 2021 STATUS approved

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Last modified February 21 10:12 EST 2024. Contains 370228 sequences. (Running on oeis4.)