A001161 -id:A001161 - cp's OEIS frontend

A001162 Numbers containing an odd number of letters.

1, 2, 3, 6, 7, 8, 10, 15, 16, 17, 21, 22, 23, 26, 27, 28, 31, 32, 33, 36, 37, 38, 40, 44, 45, 49, 50, 54, 55, 59, 60, 64, 65, 69, 70, 74, 75, 79, 81, 82, 83, 86, 87, 88, 91, 92, 93, 96, 97, 98

Offset: 1

William P. Everts [ bille(AT)regenisys.com ]

Cf. A005589, complement of A001161.

A336822 Integers with an even number of letters when written in Spanish.

Original entry on oeis.org

3, 4, 6, 8, 10, 11, 12, 15, 17, 19, 20, 23, 24, 26, 28, 33, 34, 36, 38, 40, 41, 42, 45, 47, 49, 53, 54, 56, 63, 64, 66, 68, 73, 74, 76, 78, 83, 84, 86, 88, 93, 94, 96, 98, 100, 103, 104, 106, 108, 110, 111, 112, 115, 117, 119, 120, 123, 124, 126, 128, 133, 134, 136, 138, 140, 141, 142, 145, 147, 149

Offset: 1

Rodolfo Kurchan, Aug 04 2020

			a(4) = 8 because 8 in Spanish is written "ocho" and has 4 letters.

Rodolfo Kurchan, Problem 15, Diversiones con Números y Figuras, (2000).

Cf. A001161.

Select[Range@ 150, EvenQ@ StringLength@ StringDelete[IntegerName[#, {"Spanish"}], " "] &] (* Michael De Vlieger, Aug 21 2020 *)

cp's OEIS Frontend

A001162 Numbers containing an odd number of letters.

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A336822 Integers with an even number of letters when written in Spanish.

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