The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A113243 Differences of nonzero tetranacci numbers. 2
 0, 1, 2, 3, 4, 6, 7, 11, 13, 14, 21, 25, 27, 28, 41, 48, 52, 54, 55, 79, 93, 100, 104, 106, 107, 152, 179, 193, 200, 204, 206, 207, 293, 345, 372, 386, 393, 397, 399, 400, 565, 665, 717, 744, 758, 765, 769, 771, 772, 1089, 1282, 1382, 1434, 1461, 1475, 1482 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A113244 is the primes in the above sequence; namely prime differences of tetranacci numbers. Perfect powers in this sequence include: 4 = 2^2, 25 = 5^2, 27 = 3^3, 100 = 10^2 = 2^2 * 5^2, 400 = 20^2 = 2^4 * 5^2, 1089 = 33^2 = 3^2 * 11^2. LINKS R. J. Mathar, Table of n, a(n) for n = 1..197 FORMULA {a(n)} = { A000078(i) - A000078(j) such that i>=j}. {a(n)} = nonnegative elements of the difference set of tetranacci sequence A000078. MAPLE isA113243 := proc(n) local i, j ; for j from 3 do for i from 3 to j do if A000078(j) - A000078(i) = n then return true; elif A000078(j) - A000078(i) < n then break ; end if; end do: if A000078(j) - A000078(j-1) > n then return false; end if; end do: end proc: for n from 0 to 10000 do if isA113243(n) then printf("%d, ", n) ; end if; end do: # R. J. Mathar, Oct 04 2014 CROSSREFS Cf. A000078, A113188-A113194, A113238, A113239, A113244. Sequence in context: A339510 A191930 A202113 * A130690 A308189 A074885 Adjacent sequences: A113240 A113241 A113242 * A113244 A113245 A113246 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, Oct 19 2005; corrected Oct 20 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 3 01:36 EST 2023. Contains 360024 sequences. (Running on oeis4.)