login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A218381 Numbers such that A211996(n) is not zero. 2
3, 4, 8, 14, 15, 18, 20, 24, 28, 35, 39, 46, 48, 55, 60, 63, 64, 66, 68, 80, 84, 94, 99, 100, 114, 120, 124, 126, 128, 136, 138, 143, 144, 150, 154, 155, 156, 158, 168, 180, 183, 195, 196, 203, 220, 224, 234, 238, 240, 243, 255, 258, 260, 275, 284, 288, 291 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For any n, the equation x^4 + a(n)*y^4 = z^2 is solvable in integers. - Arkadiusz Wesolowski, Aug 15 2013

LINKS

Table of n, a(n) for n=1..57.

D. Clark, An arithmetical function associated with the rank of elliptic curves, Canad. Math. Bull. Vol. 34 (2), 1991 pp. 181-185.

CROSSREFS

Cf. A211996, A218382, A228880.

Sequence in context: A250473 A049893 A307043 * A103002 A310012 A181408

Adjacent sequences:  A218378 A218379 A218380 * A218382 A218383 A218384

KEYWORD

nonn

AUTHOR

Michel Marcus, Oct 27 2012

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 22 15:30 EDT 2021. Contains 348172 sequences. (Running on oeis4.)