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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A166388 Numbers of the form q-p, where p and q are prime and q = p^0+p^1+p^2+..+p^k for some k. 0
1, 5, 10, 26, 29, 125, 290, 1090, 1682, 2794, 3482, 5942, 7922, 8189, 10202, 17162, 19526, 27890, 29930, 30928, 85850, 88724, 131069, 146690, 292538, 458330, 491402, 524285, 552050, 579122, 597530, 683930, 703922, 732512, 734450, 797158, 829922 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..37.

EXAMPLE

For p = 2 and k = 1, q = 2^0+2^1 = 1+2 = 3 is prime, hence 3-2 = 1 is in the sequence.

For p = 3 and k = 6, q = 3^0+3^1+3^2+3^3+3^4+3^5+3^6 = 1+3+9+27+81+243+729 = 1093 is prime, hence 1093-3 = 1090 is in the sequence.

CROSSREFS

Cf. A000040 (prime numbers).

Sequence in context: A038252 A211865 A083010 * A290055 A066872 A063478

Adjacent sequences:  A166385 A166386 A166387 * A166389 A166390 A166391

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Oct 13 2009

EXTENSIONS

Edited and extended by Klaus Brockhaus, Oct 16 2009

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 24 00:27 EST 2017. Contains 295164 sequences.