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 A056529 Number of iterations of sum of digits of square to reach 1, 9, 13 or 16. 2
 0, 3, 1, 2, 2, 1, 1, 2, 0, 1, 3, 1, 0, 1, 1, 0, 3, 1, 2, 3, 1, 1, 1, 2, 1, 3, 2, 3, 1, 1, 1, 2, 2, 1, 2, 2, 3, 1, 1, 2, 1, 2, 2, 3, 1, 2, 1, 1, 2, 2, 1, 1, 3, 2, 2, 1, 2, 1, 1, 1, 1, 3, 3, 3, 1, 2, 2, 1, 2, 1, 2, 2, 3, 2, 2, 2, 2, 2, 1, 2, 2, 3, 2, 2, 1, 2, 3, 2, 3, 1, 3, 2, 3, 2, 1, 2, 2, 3, 2, 1, 3, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE a(2)=3 because successive iterations give 2 -> 4 -> 7 -> 13 -> 16 -> 13 etc. CROSSREFS Cf. A004159 for sum of digits of square, A056528 for two iterations, A056020 where iteration settles to 1, A056020 where iteration settles to 9, A056527 where iteration settles to 13 and 16. Sequence in context: A287571 A214316 A236452 * A087282 A105973 A088429 Adjacent sequences:  A056526 A056527 A056528 * A056530 A056531 A056532 KEYWORD base,easy,nonn AUTHOR Henry Bottomley, Jun 19 2000 STATUS approved

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Last modified June 15 17:41 EDT 2021. Contains 345049 sequences. (Running on oeis4.)