A045726 Fibonacci numbers having initial digit '2'.

2, 21, 233, 2584, 28657, 2178309, 24157817, 267914296, 2971215073, 20365011074, 225851433717, 2504730781961, 27777890035288, 2111485077978050, 23416728348467685, 259695496911122585, 2880067194370816120

Offset: 1

Author

Jeff Burch

Keywords

• nonn
• base

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..845

Crossrefs

Intersection of A000045 and A217394.

Programs

Mathematica

Select[Array[Fibonacci, 90], First@ IntegerDigits[#] == 2 &] (* Michael De Vlieger, Mar 19 2021 *)

Extensions

a(12) corrected by Sean A. Irvine, Mar 19 2021