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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145092 Indices of the prime numbers after mapping the positive integers onto successive rings of length {1, 5, 30, 180, 1080, ...} and assigning index 0 to the smallest value in each. 0
0, 1, 3, 0, 4, 6, 10, 12, 16, 22, 24, 0, 4, 6, 10, 16, 22, 24, 30, 34, 36, 42, 46, 52, 60, 64, 66, 70, 72, 76, 90, 94, 100, 102, 112, 114, 120, 126, 130, 136, 142, 144, 154, 156, 160, 162, 174, 6, 10, 12, 16, 22, 24, 34, 40, 46, 52, 54, 60, 64, 66, 76, 90, 94, 96, 100, 114 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

After the second ring, all primes have indices that are congruent to 0 or 4 modulo 6, because index 0 is given to a value congruent to 1 (one greater than a power of six).

LINKS

Table of n, a(n) for n=1..67.

EXAMPLE

The first three rings contain these numbers:

1

.

2 3 4 5 6 (sequence begins here)

0 1 . 3 .

.........

7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 ...

0 . . .. .4 .. .6 .. .. .. 10 .. 12 .. .. .. 16 .. .. .. .. .. 22 .. 24 .. .. .. .. ...

CROSSREFS

Cf. A000040, A008588, A016957

Sequence in context: A112238 A111493 A190181 * A210878 A320373 A303274

Adjacent sequences:  A145089 A145090 A145091 * A145093 A145094 A145095

KEYWORD

easy,nonn

AUTHOR

Reikku Kulon, Oct 01 2008

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 January 17 18:14 EST 2020. Contains 330987 sequences. (Running on oeis4.)