A102122 - OEIS

A102122

Iccanobirt numbers (12 of 15): a(n) = R(R(a(n-1)) + a(n-2) + a(n-3)), where R is the digit reversal function A004086.

0, 0, 1, 1, 2, 4, 7, 31, 42, 26, 531, 302, 67, 909, 8721, 4522, 48811, 72152, 6487, 908821, 844702, 6572211, 9726782, 29139201, 58129562, 86185456, 139627251, 949140792, 656458225, 9962261161, 6171227123, 20114953831, 68392496992

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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..32.

FORMULA

a(n) = A004086(A102114(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]+a[n-3]]; Table[a[n], {n, 0, 40}]

nxt[{a_, b_, c_}]:={b, c, IntegerReverse[IntegerReverse[c]+b+a]}; NestList[nxt, {0, 0, 1}, 40][[;; , 1]] (* Harvey P. Dale, Sep 10 2024 *)

CROSSREFS

Cf. A102111-A102125.

Sequence in context: A102120 A280820 A280377 * A102123 A102125 A102124

Adjacent sequences: A102119 A102120 A102121 * A102123 A102124 A102125

KEYWORD

nonn,base,easy

AUTHOR

Jonathan Vos Post and Ray Chandler, Dec 30 2004

STATUS

approved