A024768 Prefix primes in base 8 (written in base 8).

2, 3, 5, 7, 21, 23, 27, 35, 37, 51, 53, 57, 73, 75, 211, 213, 235, 277, 351, 357, 373, 513, 533, 535, 573, 577, 737, 753, 2111, 2117, 2135, 2353, 2773, 3513, 3517, 3571, 3733, 5331, 5355, 5735, 5773, 7371, 7531, 7533, 21113, 21117, 21177, 21355, 23537, 27733

Offset: 1

Author

David W. Wilson

Keywords

• nonn
• base
• easy
• fini
• full

Comments

The final term is a(68) = 21117717.

Links

• Nathaniel Johnston, Table of n, a(n) for n = 1..68 (full sequence)

Crossrefs

Cf. A024763, A024764, A024765, A024766, A024767, A024769, A024770.

Programs

Maple

s:=[1,3,5,7]: a:=[[2],[3],[5],[7]]: l1:=1: l2:=4: do for j from l1 to l2 do for k from 1 to 4 do d:=[s[k], op(a[j])]: if(isprime(op(convert(d, base, 8, 8^nops(d)))))then a:=[op(a), d]: fi: od: od: l1:=l2+1: l2:=nops(a): if(l1>l2)then break: fi: od: for j from 1 to nops(a) do printf("%d, ", op(convert(a[j], base, 10, 10^nops(a[j])))); od: # Nathaniel Johnston, Jun 22 2011