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

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. 3
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; internal format)
OFFSET

1,1

COMMENTS

Union with A115232 gives all primes (A000040).

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 A112859

Adjacent sequences:  A115228 A115229 A115230 * A115232 A115233 A115234

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 17 2006

EXTENSIONS

Recomputed (based on recomputation of A115230) by Richard Mathar (mathar(AT)strw.leidenuniv.nl) and Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 29 2010.

Edited by N. J. A. Sloane, Apr 30 2010

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 04:20 EST 2012. Contains 205570 sequences.