A080787 a(1)=a(2)=1; a(n) = a(n-1) + last decimal digit of a(n-2).

1, 1, 2, 3, 5, 8, 13, 21, 24, 25, 29, 34, 43, 47, 50, 57, 57, 64, 71, 75, 76, 81, 87, 88, 95, 103, 108, 111, 119, 120, 129, 129, 138, 147, 155, 162, 167, 169, 176, 185, 191, 196, 197, 203, 210, 213, 213, 216, 219, 225, 234, 239, 243, 252, 255, 257, 262, 269, 271

Offset: 1

Author

Benoit Cloitre, Mar 12 2003

Keywords

• base
• nonn

Formula

a(n)=a(n-1)+a(n-2)(mod 10); for n>=3 a(n)-a(n-1)=A003893(n-2)=A000045(n-2)(mod 10)