A129693 Right truncatable primes in base 9 (written in decimal form).

2, 3, 5, 7, 19, 23, 29, 31, 47, 53, 67, 71, 173, 179, 211, 263, 269, 281, 283, 431, 479, 607, 641, 643, 647, 1559, 1613, 1619, 1901, 1907, 2371, 2423, 2531, 2549, 2551, 3881, 5471, 5791, 5827, 14033, 14519, 17117, 17167, 21341, 21347, 22783, 22787, 22943

Offset: 1

Author

Martin Renner, Jun 01 2007

Keywords

• nonn
• base
• fini
• full

Comments

There are exactly 68 right truncatable primes in base 9.

Links

• Martin Renner, Table of n, a(n) for n = 1..68
• I. O. Angell, and H. J. Godwin, On Truncatable Primes, Math. Comput. 31, 265-267, 1977.
• Eric Weisstein's World of Mathematics, Truncatable Prime.
• Index entries for sequences related to truncatable primes

Crossrefs

Cf. A024769, A076586.

Programs

Maple

Extend:= proc(n) op(select(isprime, [seq(9*n+k,k=1..8)])) end proc:
S:= {}: Agenda:= {2,3,5,7}:
while Agenda <> {} do
  S:= S union Agenda;
  Agenda:= map(Extend, Agenda);
od:
sort(convert(S,list)); # Robert Israel, Mar 25 2018