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A152853 Numbers of form 21k+1 or 21k+2 that use only digits 3 and 7. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

Cf. A152824 and A152834.

Sequence in context: A051962 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

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Last modified November 18 02:54 EST 2017. Contains 294840 sequences.