This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A318519 a(n) = A000005(n) * A003557(n). 2
 1, 2, 2, 6, 2, 4, 2, 16, 9, 4, 2, 12, 2, 4, 4, 40, 2, 18, 2, 12, 4, 4, 2, 32, 15, 4, 36, 12, 2, 8, 2, 96, 4, 4, 4, 54, 2, 4, 4, 32, 2, 8, 2, 12, 18, 4, 2, 80, 21, 30, 4, 12, 2, 72, 4, 32, 4, 4, 2, 24, 2, 4, 18, 224, 4, 8, 2, 12, 4, 8, 2, 144, 2, 4, 30, 12, 4, 8, 2, 80, 135, 4, 2, 24, 4, 4, 4, 32, 2, 36, 4, 12, 4, 4, 4, 192, 2, 42, 18, 90, 2, 8, 2, 32, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA Multiplicative with a(p^e) = (e+1)*(p^(e-1)). a(n) = A000005(n) * A003557(n). a(n) = A062355(n) / A173557(n). PROG (PARI) A003557(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 2] = f[i, 2]-1); factorback(f); }; \\ From A003557 A318519(n) = (numdiv(n)*A003557(n)); (PARI) A318519(n) = { my(f=factor(n)); prod(i=1, #f~, (f[i, 2]+1)*(f[i, 1]^(f[i, 2]-1))); }; CROSSREFS Cf. A000005, A003557, A062355, A173557. Sequence in context: A068976 A265392 A253139 * A317848 A124859 A021446 Adjacent sequences:  A318516 A318517 A318518 * A318520 A318521 A318522 KEYWORD nonn,mult AUTHOR Antti Karttunen, Sep 16 2018 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 April 25 13:31 EDT 2019. Contains 322461 sequences. (Running on oeis4.)