A294369 Indices of Fibonacci numbers (A000045) that are triangular numbers (A000217).

0, 1, 2, 4, 8, 10

Offset: 1

Author

Alex Ratushnyak, Jan 24 2018

Keywords

• nonn
• fini
• full

Comments

The sequence of Fibonacci numbers that are also triangular numbers begins: 0, 1, 1, 3, 21, 55. That is, 0 and 1 followed by A039595.

Examples

			Fibonacci(10)=55 is a triangular number, therefore 10 is in the sequence.
		

Crossrefs

Cf. A000045, A000217, A039595, A162394, A121343, A121874.