

A052999


Take nth prime p, let P = all primes that can be obtained by permuting the digits of p and possibly adding or omitting zeros; a(n) = pq where q in P is the closest to p but different from p (a(n)=0 if no such q exists).


5



0, 0, 0, 0, 90, 18, 54, 90, 1980, 199980, 18, 36, 360, 3960, 3960, 450, 450, 540, 540, 36, 36, 18, 0, 720, 18, 90, 72, 36, 90, 18, 144, 18, 36, 54, 270, 900, 414, 450, 450, 36, 18, 630, 720, 54, 18, 720, 810, 1980, 1800, 1800, 2790, 54, 180, 270, 20250, 1800, 1800, 144
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OFFSET

1,5


LINKS

Table of n, a(n) for n=1..58.


EXAMPLE

a(6)=18 since 6th prime is 13 and 3113=18. a(9)=1980 because 9th prime is 23 and the smallest prime in P different from 23 is 2003; 200323=1980.


CROSSREFS

Cf. A052902, A052998, A053544, A052495, A052484.
Sequence in context: A078293 A247899 A247902 * A050662 A236180 A332427
Adjacent sequences: A052996 A052997 A052998 * A053000 A053001 A053002


KEYWORD

base,easy,nonn


AUTHOR

N. J. A. Sloane, Mar 16 2000


EXTENSIONS

More terms from Asher Natan Auel (auela(AT)reed.edu), May 12, 2000


STATUS

approved



