A139546 - OEIS

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A139546

Numbers of form x^2+5y^2 (x>=0,y>=0) with repetition.

0, 1, 4, 5, 6, 9, 9, 14, 16, 20, 21, 21, 24, 25, 29, 30, 36, 36, 41, 45, 45, 46, 49, 49, 54, 54, 56, 61, 64, 69, 69, 70, 80, 81, 81, 81, 84, 84, 86, 89, 94, 96, 100, 101, 105, 105, 109, 116, 120, 121, 125, 126, 126, 126, 129, 129, 134, 141, 141, 144, 144, 145, 149, 150

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Primes in the sequence occur only once.

REFERENCES

David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989.

LINKS

Table of n, a(n) for n=1..64.

EXAMPLE

0 = 0^2+5*0^2,

9 = 2^2+5*1^2 = 3^2+5*0^2,