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Search: id:A061742
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| A061742 |
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Square of product of first n primes. |
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+0
11
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| 1, 4, 36, 900, 44100, 5336100, 901800900, 260620460100, 94083986096100, 49770428644836900, 41856930490307832900, 40224510201185827416900, 55067354465423397733736100, 92568222856376731590410384100
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Squares of primorials (first definition).
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,100
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EXAMPLE
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a(4) = 2^2 * 3^2 * 5^2 * 7^2 = 44100.
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MATHEMATICA
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a[n_]:=Product[Prime[i]^2, {i, 1, n}]; [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 05 2008]
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PROGRAM
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(PARI) for(n=0, 20, print(prod(k=1, n, prime(k)^2)))
(PARI) { n=-1; m=1; forprime (p=2, prime(101), write("b061742.txt", n++, " ", m^2); m*=p ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 27 2009]
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CROSSREFS
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Equals A002110^2.
Sequence in context: A009446 A134052 A127901 this_sequence A136469 A120605 A143764
Adjacent sequences: A061739 A061740 A061741 this_sequence A061743 A061744 A061745
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jun 21 2001
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