A152853 Numbers of form 21k+1 or 21k+2 that use only digits 3 and 7.

337, 737, 7373, 73333, 73733, 333377, 333733, 737333, 737773, 777337, 777737, 3333373, 3333773, 3373337, 3373777, 3777377, 3777733, 7337737, 7373333, 7373773, 7733377, 7733777, 7777373, 33337333, 33337733, 33377737, 33733373

Offset

1,1

Links

Table of n, a(n) for n=1..27.

Crossrefs

Cf. A152824 and A152834.

Sequence in context: A339480 A214492 A157999 * A142830 A160069 A201852

Adjacent sequences: A152850 A152851 A152852 * A152854 A152855 A152856

Keyword

base,nonn

Author

Zak Seidov, Dec 14 2008, Dec 26 2008

Status

approved