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 A125563 Denominator of (4n+1)!/5^n. 0
 1, 1, 5, 5, 5, 5, 1, 5, 5, 5, 5, 5, 25, 5, 5, 5, 5, 25, 25, 5, 5, 5, 25, 25, 25, 5, 5, 25, 25, 25, 25, 1, 5, 5, 5, 5, 5, 25, 5, 5, 5, 5, 25, 25, 5, 5, 5, 25, 25, 25, 5, 5, 25, 25, 25, 25, 5, 25, 25, 25, 25, 25, 125, 5, 5, 5, 5, 25, 25, 5, 5, 5, 25, 25, 25, 5, 5, 25, 25, 25, 25, 5, 25, 25, 25 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA for n>=1, a(25n)=a(25n+1)=a(5n) ; a(25n+2)=a(25n+3)=a(25n+4)=a(25n+5)=5a(5n) ; a(25n+6)=a(n) ; a(25n+7)=a(25n+8)=a(25n+9)=a(25n+10)=a(25n+11)=5a(n) ; a(25n+12)=25a(n) ; a(25n+13)=a(25n+14)=a(25n+15)=a(25n+16)=a(5n+3) ; a(25n+17)=a(25n+18)=5a(5n+3) ; a(25n+19)=a(25n+20)=a(25n+21)=a(5n+4) ; a(25n+22)=a(25n+23)=a(25n+24)=5a(5n+4) PROG (PARI) a(n)=denominator((4*n+1)!/5^n) CROSSREFS Sequence in context: A133707 A171372 A083945 * A093704 A271509 A269626 Adjacent sequences:  A125560 A125561 A125562 * A125564 A125565 A125566 KEYWORD nonn,frac AUTHOR Benoit Cloitre, Jan 01 2007 STATUS approved

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Last modified April 10 22:17 EDT 2021. Contains 342856 sequences. (Running on oeis4.)