A244426 Take the sequence of almost-natural numbers (A007376) and reverse successive subsequences of lengths 1,2,3,4,...

1, 3, 2, 6, 5, 4, 1, 9, 8, 7, 2, 1, 1, 1, 0, 5, 1, 4, 1, 3, 1, 1, 8, 1, 7, 1, 6, 1, 2, 2, 2, 1, 2, 0, 2, 9, 7, 2, 6, 2, 5, 2, 4, 2, 3, 2, 3, 1, 3, 0, 3, 9, 2, 8, 2, 3, 7, 3, 6, 3, 5, 3, 4, 3, 3, 3, 4, 3, 4, 2, 4, 1, 4, 0, 4, 9, 3, 8, 0, 5, 9, 4, 8, 4, 7, 4, 6, 4, 5, 4, 4, 7, 5, 6, 5, 5, 5, 4, 5, 3, 5, 2, 5, 1, 5

Offset

1,2

Comments

See the table in A244425 and read the table by the other antidiagonal.

Links

Table of n, a(n) for n=1..105.

Mathematica

a[n_] := Block[{m = 0, d = n, i = 1, l, p}, While[m <= d, l = m; m = 9 i*10^(i - 1) + l; i++]; i--;  p = Mod[d - l, i]; q = Floor[(d - l)/i] + 10^(i - 1); If[ p != 0, IntegerDigits[q][[p]], Mod[q - 1, 10]]]; Table[ a[ Ceiling[(Sqrt[ 8n + 1] - 1)/2]^2 - n + 1], {n, 105}]

Crossrefs

Cf. A007376, A033307, A038722, A244425.

Sequence in context: A210971 A212000 A058401 * A214417 A377440 A105027

Adjacent sequences: A244423 A244424 A244425 * A244427 A244428 A244429

Keyword

nonn,base,tabl

Author

Robert G. Wilson v, Jun 27 2014

Status

approved