A381598 Index of first term of three consecutive n's in A381597.

1, 9, 34, 147, 111, 359, 437, 389, 594, 826, 1102, 83317, 1789, 5142, 2931, 12671

Offset: 1

Author

Scott R. Shannon, Mar 01 2025

Keywords

• nonn
• more

Comments

The terms vary greatly in size - after 5.2 million terms of A381597 no three consecutive 17's or 18's have appeared, although three consecutive 19's appear at index 6474. The largest known term is a(192) = 5135798.

Crossrefs

Cf. A381597, A381599, A370708, A281511, A229037.