A069026 Smallest power of 4 with digit sum n, or 0 if no such number exists.

1, 0, 0, 4, 0, 0, 16, 0, 0, 64, 0, 0, 256, 0, 0, 0, 0, 0, 4096, 0, 0, 16384, 0, 0, 65536, 0, 0, 0, 0, 0, 1048576, 0, 0, 0, 0, 0, 16777216, 0, 0, 67108864, 0, 0, 268435456, 0, 0, 4398046511104, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4294967296, 0, 0, 17179869184, 0, 0

Offset: 1

Author

Amarnath Murthy, Apr 02 2002

Keywords

• nonn
• base

Comments

a(3k)=0. If any other zero terms are really nonzero, their value is greater than 4^31. - Larry Reeves (larryr(AT)acm.org), Dec 21 2002

Crossrefs

Cf. A069025.

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Dec 21 2002