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A143671 Number of terms in A144688 of length n. 5
10, 45, 150, 375, 750, 1200, 1713, 2227, 2492, 2492, 2225, 2041, 1575, 1132, 770, 571, 335, 180, 90, 44, 18, 12, 6, 3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Since any 5-digit member of A144688 must end in 0 or 5, a(5) = 2*a(4).

Similarly a(n) <= 2*a(n-1) for n = 6, 7, 8, 9, a(10) = a(9), and a(n) <= a(n-1) for n >= 11.

a(n) = 0 for n > 25.

LINKS

Table of n, a(n) for n=1..75.

CROSSREFS

Cf. A144688.

Sequence in context: A027800 A005714 A175705 * A221532 A241432 A317020

Adjacent sequences:  A143668 A143669 A143670 * A143672 A143673 A143674

KEYWORD

nonn,base

AUTHOR

Zak Seidov and N. J. A. Sloane, Feb 08 2009

STATUS

approved

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Last modified March 26 18:36 EDT 2019. Contains 321511 sequences. (Running on oeis4.)