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!)
A306969 Numbers congruent to 1, 2, or 4 mod 7 that are not represented by x^2+7*y^2+7*z^2. 0
2, 22, 46, 58, 85, 93, 102, 205, 298, 310, 330, 358, 466, 478, 697, 862, 949, 1222, 1402, 1513, 1957, 1978, 2962, 3502, 7165, 10558 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..26.

Irving Kaplansky, The first nontrivial genus of positive definite ternary forms, Mathematics of Computation, Vol. 64 (1995): 341-345.

CROSSREFS

Cf. A047350 (numbers congruent to {1, 2, 4} mod 7).

Sequence in context: A221762 A154798 A080142 * A200946 A322157 A156454

Adjacent sequences:  A306966 A306967 A306968 * A306970 A306971 A306972

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Mar 26 2019

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 April 16 12:45 EDT 2021. Contains 343037 sequences. (Running on oeis4.)