login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A286263 The smallest weight possible for a prime vector of order n. 3
2, 8, 19, 26, 43, 56, 79, 104, 127, 166, 223, 258, 307, 348 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A prime vector of order n is an array of n distinct primes P = (p_1, p_2, ..., p_n), such that every sum of an odd number of consecutive elements is also prime. The weight of the prime vector is the sum of its elements. For full details see Kamenetsky's paper.

Calculations by Kamenetsky and J. K. Andersen show that a(15-17) are likely to be 443, 522 and 641.

Calculations by J. K. Andersen show that a(18-21) are likely to be 762, 881, 1002 and 1259.

J. K. Andersen found the best upper bounds for a(22-23) as 1716 and 1931.

For odd n, a(n) <= A068873(n) (smallest prime which is a sum of n distinct primes).

For even n, a(n) <= A071148(n) (sum of the first n odd primes).

LINKS

Table of n, a(n) for n=1..14.

Dmitry Kamenetsky, Prime sums of primes, arXiv:1703.06778 [math.HO], 2017.

Carlos Rivera, Puzzle 875: Vector of primes that generates distinct primes

EXAMPLE

The best solution for n=5 is (3,11,5,7,17) with a weight of 43. This is a prime vector because all the generated sums are prime: 3+11+5=19, 11+5+7=23, 5+7+17=29, 3+11+5+7+17=43.

CROSSREFS

Cf. A068873, A071148, A286269.

Sequence in context: A033711 A093012 A049525 * A236327 A109071 A196134

Adjacent sequences:  A286260 A286261 A286262 * A286264 A286265 A286266

KEYWORD

nonn,more

AUTHOR

Dmitry Kamenetsky, May 05 2017

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 3 05:55 EDT 2020. Contains 336197 sequences. (Running on oeis4.)