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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A204687 a(n) = A204321(n)/4. 0 1, 3, 33, 4323, 74748993, 22349647743307203, 1998027016999666984531472383425633, 15968447842642350164774423714587589071259011612916483703599782377123 (list; graph; refs; listen; history; text; internal format) OFFSET 1,2 COMMENTS Terms of the sequence can be presented as products of the following distinct prime factors: 1, 3, 3*11, 3*11*131, 3*11*131*17291, 3*11*131*17291*298995971. Alexander R. Povolotsky, Jan 19 2012 Those factors are A121897(m) for m >= 5. - Alexander R. Povolotsky, Jun 17 2012 LINKS Table of n, a(n) for n=1..8. FORMULA a(n) = product(A126604(k), k=2...n) for n >= 2. CROSSREFS Cf. A204321, A126604, A121897. Sequence in context: A126675 A038694 A319750 * A134477 A080985 A006854 Adjacent sequences: A204684 A204685 A204686 * A204688 A204689 A204690 KEYWORD nonn AUTHOR Alexander R. Povolotsky, Jan 19 2012 STATUS approved

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Last modified August 27 17:22 EDT 2024. Contains 375471 sequences. (Running on oeis4.)