id:A061870 - OEIS Search Results

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Numbers with property that |first digit - second digit + third digit - fourth digit ...| = 1.

+0
27

1, 10, 12, 21, 23, 32, 34, 43, 45, 54, 56, 65, 67, 76, 78, 87, 89, 98, 100, 111, 120, 122, 131, 133, 142, 144, 153, 155, 164, 166, 175, 177, 186, 188, 197, 199, 210, 221, 230, 232, 241, 243, 252, 254, 263, 265, 274, 276, 285, 287, 296, 298, 320, 331, 340, 342 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`120 is in the sequence since \|1-2+0\| = 1.`
	MATHEMATICA	`fQ[n_] := Abs[Plus @@ (((-1)^Range[Floor[Log[10, n] + 1]])*IntegerDigits@n)] == 1; Select[ Range@342, fQ@# &]`
	CROSSREFS	`Cf. A008593, A060978-A060980, A060982, A061470-A061479, A061870-A061882.` `Sequence in context: A035284 A082927 A108965 this_sequence A120001 A108703 A098785` `Adjacent sequences: A061867 A061868 A061869 this_sequence A061871 A061872 A061873`
	KEYWORD	`nonn,base,easy`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), May 10 2001`

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

AT&T Labs Research