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A113238 Differences of nonzero tribonacci numbers. 6
0, 1, 2, 3, 5, 6, 9, 11, 12, 17, 20, 22, 23, 31, 37, 40, 42, 43, 57, 68, 74, 77, 79, 80, 105, 125, 136, 142, 145, 147, 148, 193, 230, 250, 261, 267, 270, 272, 273, 355, 423, 460, 480, 491, 497, 500, 502, 503, 653, 778, 846, 883, 903, 914, 920, 923, 925, 926, 1201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Primes in this sequence are A113239. Perfect powers include: 9 = 3^2, 125 = 5^3, 1681 = 41^2, 2209 = 47^2, 25281 = 159^2 = 3^2 * 53^2. A113188-A113194 deal with difference sets of Fibonacci numbers and Lucas numbers and primes in those difference sets.

LINKS

Table of n, a(n) for n=1..59.

FORMULA

{a(n)} = { A000073(i) - A000073(j) such that i>=j }. Nonnegative elements in difference set of tribonacci sequence A000073.

CROSSREFS

Cf. A000073, A113188-A113194.

Sequence in context: A286402 A175007 A284685 * A104214 A046657 A102825

Adjacent sequences:  A113235 A113236 A113237 * A113239 A113240 A113241

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, Oct 19 2005

STATUS

approved

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Last modified June 6 13:01 EDT 2020. Contains 334827 sequences. (Running on oeis4.)