This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A081310 Numbers having no representation as sum of a prime and an 3-smooth number. 4
 1, 2, 36, 78, 96, 120, 126, 144, 156, 162, 186, 204, 210, 216, 222, 276, 288, 300, 306, 324, 328, 330, 336, 342, 366, 372, 378, 396, 408, 414, 426, 438, 456, 474, 486, 498, 516, 528, 534, 540, 546, 552, 562, 576, 582, 606, 612, 624, 630, 636, 666, 672, 690 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A081308(a(n))=0; complement of A081311. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 EXAMPLE For all primes p<36 the greatest prime factor of 36-p is >3: 36-2=2*17, 36-3=3*11, 36-5=31, 36-7=29, 36-11=5*5, 36-13=23, 36-17=19, 36-19=17, 36-23=13, 36-29=7, 36-31=5, therefore 36 is a term. PROG (Haskell) a081310 n = a081310_list !! (n-1) a081310_list = filter ((== 0) . a081308) [1..] -- Reinhard Zumkeller, Jul 04 2012 CROSSREFS Cf. A000040, A003586. Sequence in context: A037418 A239343 A058517 * A187298 A069067 A278930 Adjacent sequences:  A081307 A081308 A081309 * A081311 A081312 A081313 KEYWORD nonn AUTHOR Reinhard Zumkeller, Mar 17 2003 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.

Last modified June 16 05:18 EDT 2019. Contains 324145 sequences. (Running on oeis4.)