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

1,1

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

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

Crossrefs

Cf. A024769, A076586.

Sequence in context: A000519 A088732 A336446 * A153590 A360041 A360040

Adjacent sequences: A129690 A129691 A129692 * A129694 A129695 A129696

Keyword

nonn,base,fini,full

Author

Martin Renner, Jun 01 2007

Status

approved