id:A056528 - OEIS Search Results

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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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