A294720 Palindromes in tribonacci sequence with initial values 0,1,0 (A001590).

0, 1, 2, 3, 6, 11, 7256527

Offset: 1

Author

Chai Wah Wu, Nov 07 2017

Keywords

• nonn
• base
• more
• hard

Comments

7256527 is probably the last term.

Crossrefs

Cf. A001590, A045504, A055391, A294688.

Programs

Mathematica

a = c = 0; b = 1; lst = {0}; While[a < 10^7, d = a + b + c; If[ Reverse[idn = IntegerDigits[d]] == idn, AppendTo[lst, d]]; a = b; b = c; c = d]; lst (* Robert G. Wilson v, Nov 09 2017 *)