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A089758 Primes arising in A089757. 1
31, 631, 9631, 129631, 27129631, 3027129631, 393027129631, 42393027129631, 6642393027129631, 1626642393027129631, 2311626642393027129631, 2522311626642393027129631, 2582522311626642393027129631 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjecture: Sequence is infinite.

LINKS

Table of n, a(n) for n=1..13.

MAPLE

ds:=proc(s) local j: RETURN(add(s[j]*10^(j-1), j=1..nops(s))): end: a:=[]: k1:=1: for n from 1 to 50 do for k from k1 do m:=ds([1, seq(op(convert(a[i], base, 10)), i=1..nops(a)), op(convert(3*k, base, 10))]): if isprime(m) then k1:=k+1: a:=[op(a), 3*k]: break fi od od: seq(ds([1, seq(op(convert(a[i], base, 10)), i=1..j)]), j=1..nops(a)); # C. Ronaldo

CROSSREFS

Cf. A089757.

Sequence in context: A028017 A028013 A028073 * A078891 A078914 A068147

Adjacent sequences:  A089755 A089756 A089757 * A089759 A089760 A089761

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 22 2003

EXTENSIONS

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 26 2004

STATUS

approved

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Last modified October 25 23:17 EDT 2020. Contains 338026 sequences. (Running on oeis4.)