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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178228 Numbers n such that (n^3 - 2, n^3 + 2) is a pair of cousin primes (see A178227). 2
189, 369, 435, 549, 555, 561, 819, 1245, 1491, 1719, 1779, 1839, 1875, 1935, 2175, 2289, 2415, 2451, 2595, 2769, 3141, 3441, 4401, 4611, 4851, 5655, 5775, 6075, 6099, 6795, 6969, 7125, 7239, 7365, 8109, 8139, 8325, 8361, 8385, 8535, 8685, 9591, 9765 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Necessarily n is an odd multiple of 3, LSD of n is e = 1, 5 or 9 (3^3 - 2, 7^3 + 2 are multiples of 5).

LINKS

Table of n, a(n) for n=1..43.

EXAMPLE

189^3 - 2 = 6751267 = prime(460792), 189^3 - 2 = 6751271 = prime(460793), n = 89, 1st term of sequence;

12471^3 - 2 = 1939562763109 = prime(i), i = 71166976775, 12471^3 + 2 = 1939562763113 = prime(i+1), n = 12471, 50th term.

CROSSREFS

Cf. A046132, A172494, A174370, A176130, A176229, A178227.

Sequence in context: A320709 A224674 A076759 * A211815 A292173 A231394

Adjacent sequences:  A178225 A178226 A178227 * A178229 A178230 A178231

KEYWORD

nonn

AUTHOR

Ulrich Krug (leuchtfeuer37(AT)gmx.de), May 23 2010

EXTENSIONS

Edited by N. J. A. Sloane, May 23 2010

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 October 19 13:01 EDT 2019. Contains 328222 sequences. (Running on oeis4.)