login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A280377 Partial sums of A119619. 1
1, 2, 4, 7, 31, 41, 761, 1076, 5556, 10092, 3638892, 3650442, 482652042, 496551642, 539602650, 1178115525, 20923968003525, 20925873907525, 6423299579635525, 6423418373678893, 6491526825518893, 11027299390478893, 1124011755076998158893, 1124011800169644507643 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A119619(n) = Product_{d|n} pxi(d), where pxi(m) is the product of totatives of m (A001783).

LINKS

Table of n, a(n) for n=1..24.

FORMULA

a(n) = Sum_{i=1..n} A119619(i).

PROG

(MAGMA) [&+[&*[&*[h: h in [1..d] | GCD(h, d) eq 1]: d in Divisors(k)]: k in [1..n]]: n in [1..100]]

CROSSREFS

Cf. A119619, A280378.

Sequence in context: A102121 A102120 A280820 * A102122 A102123 A102125

Adjacent sequences:  A280374 A280375 A280376 * A280378 A280379 A280380

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Jan 07 2017

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 19 15:24 EDT 2019. Contains 327198 sequences. (Running on oeis4.)