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A056528 Sum of digits of square of sum of digits of square. +0
3
1, 7, 9, 13, 13, 9, 16, 1, 9, 1, 7, 9, 13, 13, 9, 16, 10, 9, 1, 7, 9, 13, 13, 9, 16, 10, 9, 10, 16, 9, 13, 13, 9, 16, 1, 9, 10, 16, 9, 13, 13, 9, 16, 10, 9, 1, 16, 9, 13, 13, 9, 16, 10, 9, 1, 16, 9, 13, 13, 9, 16, 10, 18, 10, 16, 9, 13, 13, 9, 16, 1, 9, 10, 16, 9, 13, 13, 9, 16, 1, 9 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n)=A004159(A004159(n))

EXAMPLE

a(2)=7 because sum of digits of square of 2 is 4 and sum of digits of square of 4 is 1+6=7

CROSSREFS

Cf. A004159 for sum of digits of square, A056020 where iteration settles to 1, A056020 where iteration settles to 9, A056527 where iteration settles to 13 and 16. See also A056529.

Adjacent sequences: A056525 A056526 A056527 this_sequence A056529 A056530 A056531

Sequence in context: A048589 A121056 A112529 this_sequence A055565 A066498 A102306

KEYWORD

base,easy,nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), Jun 19 2000

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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