A264917 a(n) is the greatest prime number with prime(1) digits 1, prime(2) digits 2, prime(3) digits 3, ..., prime(n) digits n with 1 <= n <= 9 or 0 if no such prime exists.

11, 21221, 3333322121, 0, 5555555555544444443332311223, 66666666666665555555555544444443333122321, 0

Offset

1,1

Comments

This sequence is finite and has 9 terms.

a(4)=0 and a(7)=0, since all the candidates are divisible by 3.

a(9)=99...988...877...766...655..544444443333322211 is the last term.

Links

Giovanni Resta, Table of n, a(n) for n = 1..9

Crossrefs

Cf. A272161.

Sequence in context: A252862 A232066 A330301 * A198668 A346206 A198707

Adjacent sequences: A264914 A264915 A264916 * A264918 A264919 A264920

Keyword

nonn,base,fini,full

Author

Pierre CAMI, Apr 30 2016

Extensions

a(5)-a(7) from Giovanni Resta, May 05 2016

Status

approved