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 A045877 Rotating digits of a(n)^2 right once still yields a square. 4
 1, 2, 3, 16, 21, 31, 129, 221, 247, 258, 1062, 1593, 1964, 2221, 13516, 17287, 18516, 19821, 22221, 28064, 29631, 103764, 182362, 222221, 273543, 1246713, 1509437, 1635219, 1856538, 2222221, 2253804, 2749249, 2784807, 11619096, 11949507 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Squares resulting in leading zeros excluded. (2*10^k-11)/9 are terms, i.e. A165402 is a subsequence. - Chai Wah Wu, Apr 23 2022 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..1838 Eric Weisstein's World of Mathematics, Square Number EXAMPLE 13516^2 = 18268225{6} -> {6}18268225 = 24865^2. PROG (Python) from itertools import count, islice from sympy.solvers.diophantine.diophantine import diop_DN def A045877_gen(): # generator of terms for l in count(0): l1, l2 = 10**(l+1), 10**l yield from sorted(set(abs(x) for z in (diop_DN(10, m*(1-l1)) for m in range(10)) for x, y in z if l1 >= x**2 >= l2)) A045877_list = list(islice(A045877_gen(), 30)) # Chai Wah Wu, Apr 23 2022 CROSSREFS Cf. A000290, A045878, A035126, A035128, A165402. Sequence in context: A122656 A171458 A044905 * A261840 A100643 A067037 Adjacent sequences: A045874 A045875 A045876 * A045878 A045879 A045880 KEYWORD nonn,base AUTHOR Erich Friedman EXTENSIONS More terms from Patrick De Geest, Nov 15 1998 STATUS approved

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Last modified April 21 04:17 EDT 2024. Contains 371850 sequences. (Running on oeis4.)