id:A076160 - OEIS Search Results

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Sod_4 - sod_3 + sod_2 - sod_1, where sod_k is the sum of k-th powers of digits of n.

+0
1

0, 0, 10, 60, 204, 520, 1110, 2100, 3640, 5904, 0, 0, 10, 60, 204, 520, 1110, 2100, 3640, 5904, 10, 10, 20, 70, 214, 530, 1120, 2110, 3650, 5914, 60, 60, 70, 120, 264, 580, 1170, 2160, 3700, 5964, 204, 204, 214, 264, 408, 724, 1314, 2304, 3844, 6108 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`A quasiperiodic function.`
	FORMULA	`Sod_4 - sod_3 + sod_2 - sod_1 = sum(d(d-1)(d^2+1)), d's are digits of n`
	EXAMPLE	`a(4) = 204 = 4(4-1)(4^2+1), a(5) = 520 = 5(5-1)(5^2+1).`
	CROSSREFS	`Sequence in context: A065641 A121874 A144560 this_sequence A004406 A003472 A112502` `Adjacent sequences: A076157 A076158 A076159 this_sequence A076161 A076162 A076163`
	KEYWORD	`nonn,base`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Nov 01 2002`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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