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A053542 Distance from n-th composite number (A002808) to next prime. 1
1, 1, 3, 2, 1, 1, 3, 2, 1, 1, 3, 2, 1, 5, 4, 3, 2, 1, 1, 5, 4, 3, 2, 1, 3, 2, 1, 1, 3, 2, 1, 5, 4, 3, 2, 1, 5, 4, 3, 2, 1, 1, 5, 4, 3, 2, 1, 3, 2, 1, 1, 5, 4, 3, 2, 1, 3, 2, 1, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 3, 2, 1, 1, 3, 2, 1, 1, 3, 2, 1, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 3, 2, 1, 5, 4, 3, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..103.

FORMULA

Beginning with 2, make sequence of composites; measure distances to next prime

EXAMPLE

a(1)=4, composite; distance to next prime, 5, is 1.

MATHEMATICA

Table[NextPrime[n]-n, {n, Select[Range[150], CompositeQ]}] (* Harvey P. Dale, Apr 28 2016 *)

CROSSREFS

Cf. A002808.

Sequence in context: A010268 A181657 A172254 * A087284 A262311 A242950

Adjacent sequences:  A053539 A053540 A053541 * A053543 A053544 A053545

KEYWORD

easy,nonn

AUTHOR

Enoch Haga, Jan 16 2000

EXTENSIONS

Edited by N. J. A. Sloane, Sep 09 2011

STATUS

approved

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Last modified June 20 05:01 EDT 2019. Contains 324229 sequences. (Running on oeis4.)