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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A201544 Odd numbers of the form x^2 + 2*y^2 with positive integers x and y.

Original entry on oeis.org

3, 9, 11, 17, 19, 27, 33, 41, 43, 51, 57, 59, 67, 73, 75, 81, 83, 89, 97, 99, 107, 113, 121, 123, 129, 131, 137, 139, 147, 153, 163, 171, 177, 179, 187, 193, 201, 209, 211, 219, 225, 227, 233, 241, 243, 249, 251, 257, 267, 275, 281, 283, 289, 291, 297, 307
Offset: 1

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Author

Zak Seidov, Dec 02 2011

Keywords

Comments

All terms == {1,3} mod 8. Terms that are not multiple of some previous term are prime numbers (see A033203, except for the first term 2 there).
For the numbers with positive proper representations see A225771 without member 1, the subsequence without 75 = 3*5^2, 147 = 3*7^2, 225 = (3*5)^2, 275 = 5^2*11, ... - Wolfdieter Lang, Jan 14 2025

Crossrefs

Intersection of A005408 and A154777.
Cf. A033200 (primes), A033203, A225771.
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