A136428 First differences of A064770.

1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, 67, 1, 0, 0, 1, 0, 0, 0, 0, 1, 7, 1, 0, 0, 1, 0, 0, 0, 0, 1, -3, 1, 0, 0, 1, 0

Offset

0,10

Comments

a(10*n+k) = 0 for k = 1, 2, 4, 5, 6, 7;

a(10*n+k) = 1 for k = 0, 3, 8;

a(100*n+10*k+9) = -3 for k = 1, 2, 4, 5, 6, 7;

a(100*n+10*k+9) = 7 for k = 0, 3, 8;

a(1000*n+100*k+99) = -33 for k = 1, 2, 4, 5, 6, 7;

a(1000*n+100*k+99) = 67 for k = 0, 3, 8.

Links

R. Zumkeller, Table of n, a(n) for n = 0..9999

Formula

a(n) = (2*A010052(m mod 10) - 1)*rounded(((1+A010052(m mod 10))*10^k)/3) where n = m*10^k - 1 with m mod 10 > 0.

Crossrefs

Sequence in context: A157307 A036949 A059515 * A271697 A226371 A298937

Adjacent sequences: A136425 A136426 A136427 * A136429 A136430 A136431

Keyword

sign

Author

Reinhard Zumkeller, Dec 30 2007

Status

approved