OFFSET
1,3
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.
EXAMPLE
Fibonacci(10)=55 is a triangular number, therefore 10 is in the sequence.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Alex Ratushnyak, Jan 24 2018
STATUS
approved