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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A092257 Sum_i [i*(i-th digit)] for n-th prime. 0
3, 5, 7, 7, 3, 7, 15, 19, 8, 20, 5, 17, 6, 10, 18, 11, 23, 8, 20, 9, 13, 25, 14, 26, 23, 4, 10, 22, 28, 12, 26, 10, 28, 34, 36, 14, 32, 22, 34, 24, 42, 20, 22, 28, 40, 46, 7, 15, 27, 33, 17, 35, 13, 15, 33, 23, 41, 19, 37, 21, 27, 29, 24, 8, 14, 26, 12, 30, 32, 38, 22, 40, 36, 26, 44 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The sequence is highly non-monotonic. a(n) appears in the correlation coefficient between digits of p(n) and their indices.

LINKS

Table of n, a(n) for n=1..75.

FORMULA

a(n) = Sum_i [i*(i-th digit)] for n-th prime

EXAMPLE

a(7)=15 because p[7]=17 and 1*1+2*7=15

CROSSREFS

Sequence in context: A130159 A127314 A294499 * A316189 A297346 A211517

Adjacent sequences:  A092254 A092255 A092256 * A092258 A092259 A092260

KEYWORD

easy,nonn,base

AUTHOR

Zak Seidov, Feb 20 2004

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 April 8 00:29 EDT 2020. Contains 333311 sequences. (Running on oeis4.)