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!)
A054553 Prime number spiral (clockwise, Northeast spoke). 9
2, 5, 41, 127, 269, 467, 751, 1093, 1523, 2027, 2621, 3299, 4007, 4861, 5749, 6763, 7867, 9041, 10273, 11719, 13121, 14723, 16319, 18061, 19963, 21851, 23857, 26021, 28289, 30661, 33029, 35531, 38201, 40993, 43759, 46751, 49789, 52957, 56197 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

8-spoke wheel overlays prime number spiral; hub is 2 in shell 0; 8 spokes radiate from this hub; this is Northeast, clockwise.

LINKS

Ivan Panchenko, Table of n, a(n) for n = 0..1000

FORMULA

a(n) = A000040(A054554(n+1)). - R. J. Mathar, Aug 29 2018

EXAMPLE

Begin a prime number spiral at shell 0 (prime 2), proceed clockwise, Northeast.

MATHEMATICA

Table[ Prime[4n^2 - 10n + 7], {n, 1, 40} ]

PROG

(MAGMA) [NthPrime(4*n^2 - 10*n + 7): n in [1..40]]; // Vincenzo Librandi, Aug 29 2018

CROSSREFS

Cf. A054554, A054551, A054555, A054564, A054566, A054568, A054570, A053999.

Sequence in context: A072439 A286560 A002592 * A185052 A088547 A009457

Adjacent sequences:  A054550 A054551 A054552 * A054554 A054555 A054556

KEYWORD

easy,nonn

AUTHOR

Enoch Haga and G. L. Honaker, Jr., Apr 10 2000

EXTENSIONS

Edited by Robert G. Wilson v, Feb 25 2002

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 August 11 15:12 EDT 2020. Contains 336428 sequences. (Running on oeis4.)