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A204518 Numbers such that floor[a(n)^2 / 6] is a square. 19
0, 1, 2, 3, 5, 10, 27, 49, 98, 267, 485, 970, 2643, 4801, 9602, 26163, 47525, 95050, 258987, 470449, 940898, 2563707, 4656965, 9313930, 25378083, 46099201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Or: Numbers such that their square, with its last base-6 digit dropped, is again a square. (For the three initial terms whose square has only one digit in base 6, this is then meant to yield zero.)

LINKS

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

FORMULA

A204518(n)=sqrt(A055851(n)).

PROG

(PARI) b=6; for(n=0, 2e9, issquare(n^2\b) & print1(n", "))

CROSSREFS

Cf. A023110 (base 10), A204502 (base 9), A204514 (base 8), A204516 (base 7), A204520 (base 5), A004275 (base 4), A055793 (base 3), A055792 (base 2).

Sequence in context: A011833 A007695 A133662 * A223545 A088938 A000617

Adjacent sequences:  A204515 A204516 A204517 * A204519 A204520 A204521

KEYWORD

nonn,base

AUTHOR

M. F. Hasler, Jan 15 2012

STATUS

approved

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Last modified April 20 19:58 EDT 2014. Contains 240821 sequences.