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A181585 "Early bird" squares: write the square numbers in a string 149162536496481100... . Sequence gives numbers k such that k^2 occurs in the string ahead of its natural place. 0
7, 8, 21, 25, 46, 97, 129, 161, 196, 221, 245, 258, 277, 296, 350, 436, 460, 592, 661, 694, 789, 804, 875, 877, 1250, 2025, 2221, 3500, 3959, 4020, 5461, 5920, 7925, 9607, 12500, 14772, 19821, 20010, 21825, 22011, 22221, 24012, 25225, 25375, 25388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponding positions of the k^2's in a string 149162536496481100... are 2, 9, 23, 5, 112, 209, 395, 336, 496, 465, 656, 935, 65, 486, 603, 75, 112, 1115, 2317, 3163, 2329, 1987, 252, 421, 4036, 4279, 7092, ... .

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

s="1"; ss={}; Do[tsn=ToString[n^2]; If[ !StringFreeQ[s, tsn], AppendTo[ss, n]; Print[n]]; s=s<>tsn, {n, 2, 99999}];

CROSSREFS

Cf. A141817.

Sequence in context: A322636 A308926 A152043 * A060291 A132899 A051175

Adjacent sequences:  A181582 A181583 A181584 * A181586 A181587 A181588

KEYWORD

base,nonn,changed

AUTHOR

Zak Seidov, Oct 31 2010

STATUS

approved

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Last modified July 22 15:23 EDT 2019. Contains 325224 sequences. (Running on oeis4.)