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A038810 a(n) is the number of ways to write the number n as dk...di...d2d1d0 where digit di represents di * (di+1)^i, restricting di to 0..9. 0
1, 1, 2, 2, 3, 3, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 9, 9, 11, 11, 13, 13, 13, 13, 15, 15, 16, 16, 17, 17, 17, 17, 19, 19, 19, 19, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 24, 24, 25, 25, 27, 27, 26, 26, 30, 30, 32, 32, 33, 33, 36, 36, 39, 39, 39, 39, 38, 38, 39, 39, 39, 39, 42, 42, 44 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..74.

EXAMPLE

a(7)=5 since 7 = (7*8^0) = (1*2^1)+(5*6^0) = (2*3^1)+(1*2^0) = (1*2^2)+(0*1^1)+(3*4^0) = (1*2^2)+(1*2^1)+(1*2^0), which are the numbers {7,15,21,103,111}.

CROSSREFS

Sequence in context: A099961 A286107 A285735 * A178503 A211275 A240542

Adjacent sequences:  A038807 A038808 A038809 * A038811 A038812 A038813

KEYWORD

nonn,base

AUTHOR

Naohiro Nomoto

EXTENSIONS

More terms and additional comments from Larry Reeves (larryr(AT)acm.org), Mar 16 2001.

STATUS

approved

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Last modified May 22 06:32 EDT 2019. Contains 323478 sequences. (Running on oeis4.)