The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A246817 Possible number of trailing zeros in hyperfactorials (A002109). 2
 0, 5, 15, 30, 50, 100, 130, 165, 205, 250, 350, 405, 465, 530, 600, 750, 830, 915, 1005, 1100, 1300, 1405, 1515, 1630, 1750, 2125, 2255, 2390, 2530, 2675, 2975, 3130, 3290, 3455, 3625, 3975, 4155, 4340, 4530, 4725, 5125, 5330, 5540, 5755, 5975, 6425, 6655 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The number of trailing zeros in A002109 increases every 5 terms since the exponent of the factor 5 increases every 5 terms and the exponent of the factor 2 increases every 2 terms. LINKS Chai Wah Wu, Table of n, a(n) for n = 1..1000 PROG (Python) from sympy import multiplicity A246817, p5 = [0], 0 for n in range(5, 5*10**3, 5): ....p5 += multiplicity(5, n)*n ....A246817.append(p5) # Chai Wah Wu, Sep 05 2014 CROSSREFS Cf. A002109, A191610, A246839. Sequence in context: A319930 A028895 A194150 * A010898 A048065 A048021 Adjacent sequences:  A246814 A246815 A246816 * A246818 A246819 A246820 KEYWORD nonn,base AUTHOR Chai Wah Wu, Sep 03 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 29 11:36 EST 2020. Contains 338765 sequences. (Running on oeis4.)