A074861 Iccanobirt sequence: a(n) = R(a(n-1)) + R(a(n-2)) + R(a(n-3)) where a(1)=a(2)=a(3)=1 and R(n) (A004086) is the reverse of n.

1, 1, 1, 3, 5, 9, 17, 85, 138, 960, 958, 1759, 10499, 109831, 247873, 617044, 958359, 1773317, 8528346, 14525888, 102424570, 170715000, 164793813, 394338733, 656748025, 1177078610, 1027388860, 1378392568, 9510483643, 12805616091

Offset: 1

Author

Felice Russo, Sep 11 2002

Keywords

• easy
• base
• nonn

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000213.

Programs

Mathematica

nxt[{a_,b_,c_}]:={b,c,FromDigits[Reverse[IntegerDigits[a]]] + FromDigits[ Reverse[IntegerDigits[b]]] + FromDigits[ Reverse[ IntegerDigits[c]]]}; Transpose[NestList[nxt,{1,1,1},30]][[1]] (* Harvey P. Dale, Nov 13 2012 *)

Extensions

More terms from David Garber, Oct 23 2002

Definition adapted to offset by Georg Fischer, Jun 18 2021