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

1,1

Comments

The final term is a(68) = 21117717.

Links

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

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

Crossrefs

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

Sequence in context: A320584 A209191 A162948 * A024769 A340112 A376776

Adjacent sequences: A024765 A024766 A024767 * A024769 A024770 A024771

Keyword

nonn,base,easy,fini,full

Author

David W. Wilson

Status

approved