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A254064 Positive integers whose square is expressible in exactly one way as x^2 + 6xy + y^2, with 0 < x < y. 4
7, 14, 17, 21, 23, 28, 31, 34, 35, 41, 42, 46, 47, 51, 56, 62, 63, 68, 69, 70, 71, 73, 77, 79, 82, 84, 85, 89, 91, 92, 93, 94, 97, 102, 103, 105, 112, 113, 115, 123, 124, 126, 127, 133, 136, 137, 138, 140, 141, 142, 146, 151, 153, 154, 155, 158, 164, 167 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Colin Barker, Table of n, a(n) for n = 1..750

EXAMPLE

7 is in the sequence because the only solution to x^2 + 6xy + y^2 = 49 with 0 < x < y is (x,y) = (2,3).

CROSSREFS

Cf. A084645, A232437, A248599, A254063.

Sequence in context: A100599 A198390 A118905 * A257224 A092433 A056203

Adjacent sequences:  A254061 A254062 A254063 * A254065 A254066 A254067

KEYWORD

nonn

AUTHOR

Colin Barker, Jan 24 2015

STATUS

approved

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Last modified December 14 01:22 EST 2019. Contains 329978 sequences. (Running on oeis4.)