A220696 The positions of those permutations in A030298 where the first element is one (fixed).

1, 2, 4, 5, 10, 11, 12, 13, 14, 15, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179

Offset

1,2

Comments

Correspondingly gives the positions of those terms in A030299 whose first digit is 1, as long as the decimal encoding system employed is valid.

Links

A. Karttunen, Table of n, a(n) for n = 1..5914

Formula

a(1)=1; and for n>1, a(n)=A220695(n-1)+1.

Prog

(Scheme with Antti Karttunen's intseq-library): (define A220696 (COMPLEMENT 1 A220656))
;; Alternative definition:
(define (A220696v2 n) (if (< n 2) n (+ 1 (A220695 (- n 1)))))

Crossrefs

Complement: A220656. Cf. A072795.

Sequence in context: A173817 A198383 A334268 * A275482 A156799 A003278

Adjacent sequences: A220693 A220694 A220695 * A220697 A220698 A220699

Keyword

nonn

Author

Antti Karttunen, Dec 17 2012

Status

approved