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 A153753 Numbers n such that there are 18 digits in n^2 and for each factor f of 18 (1,2,3,6,9) the sum of digit groupings of size f is a square. 1
 324344373, 333306315, 333321861, 333359685, 333361029, 334363803, 369396732, 370397193, 407380269, 407381484, 444475035, 666636972, 666695028, 666701463, 702667239, 702671124, 702736170, 703667130, 704741610 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This series is a subset of both A153745 and A061910. LINKS EXAMPLE 324344373^2 = 105199272296763129; 1+0+5+1+9+9+2+7+2+2+9+6+7+6+3+1+2+9 = 81 = 9^2; 10+51+99+27+22+96+76+31+29 = 441 = 21^2; 105+199+272+296+763+129 = 1764 = 42^2; 105199+272296+763129 = 1140624 = 1068^2; 105199272+296763129 = 401962401 = 20049^2. CROSSREFS Cf. A153745, A061910, A004159. Sequence in context: A184573 A112429 A104923 * A035794 A260083 A233708 Adjacent sequences:  A153750 A153751 A153752 * A153754 A153755 A153756 KEYWORD nonn,base,fini,full AUTHOR Doug Bell, Dec 31 2008 STATUS approved

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Last modified May 22 19:46 EDT 2019. Contains 323481 sequences. (Running on oeis4.)