A056529 - OEIS

A056529

Number of iterations of sum of digits of square to reach 1, 9, 13 or 16.

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

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..105.

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: A214316 A236452 A376309 * A087282 A105973 A088429

Adjacent sequences: A056526 A056527 A056528 * A056530 A056531 A056532

KEYWORD

base,easy,nonn

AUTHOR

Henry Bottomley, Jun 19 2000

STATUS

approved