A202259 Right-truncatable nonprimes: every prefix is nonprime number.

0, 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 40, 42, 44, 45, 46, 48, 49, 60, 62, 63, 64, 65, 66, 68, 69, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 120, 121, 122, 123, 124, 125, 126, 128, 129, 140, 141, 142

Offset: 1

Author

Jaroslav Krizek, Dec 25 2011

Keywords

• nonn
• base

Comments

Supersequence of A202260, A202265. - Barry Carter, Sep 16 2016

Links

• Robert Israel, Table of n, a(n) for n = 1..10000
• Barry Carter, Table of n, a(n) for n=1..23498959 (bz2 compressed)
• Barry Carter, Mathematica package

Crossrefs

Cf. A012883 (right-truncatable noncomposites), A024770 (right-truncatable primes), A202260 (right-truncatable composites).

Programs

Maple

filter:= proc(n) option remember; not isprime(n) and procname(floor(n/10)) end proc:
for i from 0 to 9 do filter(i):= not isprime(i) od:
select(filter, [$0..1000]); # Robert Israel, Nov 01 2016