This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A053612 Numbers such that 1+2+3...+a(n) = 1+4+9+...+r^2, for some r. 4
 1, 10, 13, 645 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES Joe Roberts, Lure of the Integers, page 245 (entry for 645). LINKS R. Finkelstein, H. London, On triangular numbers which are sums of consecutive squares, J. Number Theory 4 (1972), 455-462. EXAMPLE 1^2 + 2^2 + 3^2 + 4^2 + 5^2 = 1 + 2 + 3 + ... + 10, so 10 is in the sequence. CROSSREFS Cf. A039596, A053611. Sequence in context: A164766 A075828 A153584 * A072146 A074674 A241041 Adjacent sequences:  A053609 A053610 A053611 * A053613 A053614 A053615 KEYWORD fini,full,nonn AUTHOR Jud McCranie, Mar 19 2000 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 12 17:33 EST 2019. Contains 329960 sequences. (Running on oeis4.)