A181672 - OEIS

A181672

The odd terms (a1,a3,a5,...) are in an arithmetic progression (1,2,3,...), while the even terms (a2,a4,a6,...) give the number of letters of the given odd term.

1, 3, 2, 3, 3, 5, 4, 4, 5, 4, 6, 3, 7, 5, 8, 5, 9, 4, 10, 3, 11, 6, 12, 6, 13, 8, 14, 8, 15, 7, 16, 7, 17, 9, 18, 8, 19, 8, 20, 6, 21, 9, 22, 9, 23, 11, 24, 10, 25, 10, 26, 9, 27, 11, 28, 11, 29, 10, 30, 6, 31, 9, 32, 9, 33, 11, 34, 10

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..68.

FORMULA

a(2n-1) = n.

a(2n) = A005589(n).

EXAMPLE

(ONE - 3 letters, TWO - 3 letters, THREE - 5 letters, FOUR - 4 letters, FIVE - 4 letters...)

CROSSREFS

Sequence in context: A230010 A230847 A234300 * A125748 A058680 A070544