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A210311 Primes that can be represented exactly in one way as a^2 + b^2 + c^2, 0 < a <= b <= c. 1
3, 11, 17, 19, 29, 43, 53, 61, 67, 73, 97, 109, 157, 163, 193, 277, 397 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Note that there are no primes = 7 mod 8.

This sequence is probably complete. Is there a proof?

There are no more terms < 10^7. - Donovan Johnson, Mar 22 2012

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

{p,a,b,c}: {3,1,1,1}, {11,1,1,3}, {17,2,2,3}, {19,1,3,3}, {29,2,3,4}, {43,3,3,5}, {53,1,4,6}, {61,3,4,6}, {67,3,3,7}, {73,1,6,6}, {97,5,6,6}, {109,3,6,8}, {157,2,3,12}, {163,1,9,9}, {193,6,6,11}, {277,4,6,15}, {397,3,8,18}.

CROSSREFS

Cf. A181786, A210338.

Sequence in context: A038946 A095280 A085317 * A033200 A309581 A291277

Adjacent sequences:  A210308 A210309 A210310 * A210312 A210313 A210314

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 20 2012

STATUS

approved

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Last modified September 20 13:56 EDT 2021. Contains 347586 sequences. (Running on oeis4.)