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!)
A115231 Primes p which cannot be written in the form 2^i + q^j where i >= 0, j >= 1, q = odd prime. 4
149, 331, 373, 509, 701, 757, 809, 877, 907, 997, 1019, 1087, 1259, 1549, 1597, 1619, 1657, 1759, 1777, 1783, 1867, 1973, 2293, 2377, 2503, 2579, 2683, 2789, 2843, 2879, 2909, 2999, 3119, 3163, 3181, 3187, 3299, 3343, 3433, 3539, 3643, 3697, 3739, 3779 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Union with A115232 gives all primes (A000040).

A subsequence of A095842. - M. F. Hasler, Nov 20 2014

LINKS

Table of n, a(n) for n=1..44.

EXAMPLE

A000040(35) = 149 = 2^7+3*7 = 2^6+5*17 = 2^5+3*3*13 =

2^4+7*19 = 2^3+3*47 = 2^2+5*29 = 2^1+3*7*7 = 2^0+2*2*37, therefore 149 is a term (A115230(35)=0).

CROSSREFS

Cf. A115230, A115232, A115233, A000079, A061345.

Sequence in context: A146137 A071331 A095842 * A142359 A185692 A216312

Adjacent sequences:  A115228 A115229 A115230 * A115232 A115233 A115234

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jan 17 2006

EXTENSIONS

Recomputed (based on recomputation of A115230) by R. J. Mathar and Reinhard Zumkeller, Apr 29 2010.

Edited by N. J. A. Sloane, Apr 30 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 21 17:44 EST 2017. Contains 295004 sequences.