A362435 a(1) = 18; thereafter a(n) = a(n-1) + difference between first two digits of a(n-1).

18, 25, 28, 34, 35, 37, 41, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44

Offset: 1

Author

N. J. A. Sloane, Apr 21 2023

Keywords

• nonn
• easy

Comments

44 is a fixed point.

References

• GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 36.

Links

• Index entries for linear recurrences with constant coefficients, signature (1).

Crossrefs

Cf. A006507, A232485.

Formula

G.f.: x*(18 + 7*x + 3*x^2 + 6*x^3 + x^4 + 2*x^5 + 4*x^6 + 3*x^7)/(1 - x). - Elmo R. Oliveira, Aug 03 2024