A153211 - OEIS

This site is supported by donations to The OEIS Foundation.

A153211

Sum of digits of n, times digital reversal of sum of digits of n.

1, 4, 9, 16, 25, 36, 49, 64, 81, 1, 4, 9, 16, 25, 36, 49, 64, 81, 10, 4, 9, 16, 25, 36, 49, 64, 81, 10, 121, 9, 16, 25, 36, 49, 64, 81, 10, 121, 252, 16, 25, 36, 49, 64, 81, 10, 121, 252, 403, 25, 36, 49, 64, 81, 10, 121, 252, 403, 574, 36, 49, 64, 81, 10, 121, 252, 403, 574 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`The fixed points of this sequence {n such that a(n) = n} are A110921.`
	FORMULA	`a(n) = SOD(n)R(SOD(n)) = A007953(n)A004086(A007953(n)).`
	EXAMPLE	`a(19) = (1+9)R(1+9) = 1001 = 101 = 10. a(79) = 976 because (7+9)R(7+9) = 16*61 = 976.`
	CROSSREFS	`Cf. A004086, A007953, A110921.` `Sequence in context: A003132 A062331 A069940 * A118881 A098733 A083163` `Adjacent sequences: A153208 A153209 A153210 * A153212 A153213 A153214`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Dec 20 2008`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 21:56 EST 2012. Contains 205860 sequences.