A102123 Iccanobirt numbers (13 of 15): a(n) = R(R(a(n-1)) + a(n-2) + R(a(n-3))), where R is the digit reversal function A004086.

0, 0, 1, 1, 2, 4, 7, 31, 42, 26, 711, 761, 49, 279, 8811, 1651, 44311, 38141, 55006, 45901, 34108, 990681, 161132, 5891031, 6129461, 8041777, 45820251, 74839842, 60558487, 202825861, 635089352, 309192535, 7549098331, 8252802091

Offset

0,5

Comments

Digit reversal variation of tribonacci numbers A000073.

Inspired by Iccanobif numbers: A001129, A014258-A014260.

Links

Table of n, a(n) for n=0..33.

Formula

a(n) = A004086(A102115(n)).

Mathematica

R[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Clear[a]; a[0]=0; a[1]=0; a[2]=1; a [n_]:=a[n]=R[R[a[n-1]]+a[n-2]+R[a[n-3]]]; Table[a[n], {n, 0, 40}]

Crossrefs

Cf. A102111-A102125.

Sequence in context: A280820 A280377 A102122 * A102125 A102124 A280713

Adjacent sequences: A102120 A102121 A102122 * A102124 A102125 A102126

Keyword

nonn,base,easy

Author

Jonathan Vos Post and Ray Chandler, Dec 30 2004

Status

approved