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

1,4

Links

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

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 *)

Crossrefs

Cf. A000213.

Sequence in context: A118330 A268212 A062221 * A281852 A120941 A108227

Adjacent sequences: A074858 A074859 A074860 * A074862 A074863 A074864

Keyword

easy,base,nonn

Author

Felice Russo, Sep 11 2002

Extensions

More terms from David Garber, Oct 23 2002

Definition adapted to offset by Georg Fischer, Jun 18 2021

Status

approved