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 A030688 Smallest nontrivial extension of n-th square which is a square not ending 00. 2
 16, 49, 961, 169, 256, 361, 49284, 64009, 81225, 100489, 121104, 1444, 169744, 196249, 225625, 256036, 289444, 3249, 361201, 400689, 4414201, 484416, 529984, 576081, 625681, 6765201, 729316, 784996, 8415801, 900601, 9616201 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10000 PROG (Python) from gmpy2 import isqrt def A030688(n): d, nd = 10, 10*n**2 while True: x = isqrt(nd-1)+1 if not x % 10: x += 1 x = x**2 if x < nd+d: return int(x) d *= 10 nd *= 10 # Chai Wah Wu, May 24 2016 CROSSREFS Cf. A030689. Sequence in context: A104992 A153483 A030686 * A235962 A235573 A186850 Adjacent sequences: A030685 A030686 A030687 * A030689 A030690 A030691 KEYWORD nonn,base AUTHOR Patrick De Geest STATUS approved

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Last modified July 14 16:00 EDT 2024. Contains 374322 sequences. (Running on oeis4.)