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A113239 Prime differences of tribonacci numbers. 6
2, 3, 5, 11, 17, 23, 31, 37, 43, 79, 193, 491, 503, 653, 883, 1201, 10607, 19009, 19469, 19489, 34963, 35809, 46499, 223273, 223313, 391231, 409817, 410731, 532159, 634061, 754549, 1383769, 1389533, 2552621, 2555753, 3311233, 4477453, 4700621 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A113238 is the difference set of tribonacci numbers. 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..38.

FORMULA

a(n) = intersection of primes A000040 and difference set of tribonacci numbers A113238. Positive prime values of {A000073(i) - A000073(j) such that i>=j}.

EXAMPLE

a(1) = 2 because 4 - 2 = 2 where 4 and 2 are tribonacci numbers.

a(2) = 3 because 7 - 4 = 3 where 7 and 4 are tribonacci numbers.

a(3) = 5 because 7 - 2 = 5 where 7 and 2 are tribonacci numbers.

a(4) = 11 because 13 - 2 = 11 where 13 and 2 are tribonacci numbers.

a(5) = 17 because 24 - 7 = 17 where 24 and 7 are tribonacci numbers.

CROSSREFS

Cf. A000040, A000073, A113188-A113194, A113238.

Sequence in context: A045309 A103664 A129942 * A049553 A049595 A258039

Adjacent sequences:  A113236 A113237 A113238 * A113240 A113241 A113242

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, Oct 19 2005

STATUS

approved

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Last modified April 9 06:59 EDT 2020. Contains 333344 sequences. (Running on oeis4.)