A265899 After a(1) = 1, positions of descents in A265894.

1, 3, 6, 8, 11, 14, 17, 20, 24, 27, 31, 34, 38, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77, 81, 85, 89, 94, 98, 102, 106, 111, 115, 120, 124, 128, 133, 137, 142, 146, 151, 156, 160, 165, 169, 174, 179, 184, 188, 193, 198, 202, 207, 212, 217, 222, 227, 231, 236, 241, 246, 251, 256, 261, 266, 271, 276, 281, 286, 291, 296, 301

Offset

1,2

Comments

Numbers n for which A099563(A001813(n)) <= A099563(A001813(n-1)), where A001813(n) = (2n)! / n!, and A099563 gives the most significant digit in the factorial base representation (A007623) of n.

Links

Antti Karttunen, Table of n, a(n) for n = 1..1503

Prog

(PARI)
A099563(n) = { my(i=2, dig=0); until(0==n, dig = n % i; n = (n - dig)/i; i++); return(dig); };
A265894 = n -> A099563((2*n)! / n!);
my(i=0, p=1, n=0); while(i < 60, n++; my(k = A265894(n)); if(k <= p, i++; print1(n, ", ")); p = k; );
(Scheme)
;; With Antti Karttunen's IntSeq-library.
(define A265899 (MATCHING-POS 1 1 (lambda (n) (<= (A265894 n) (A265894 (- n 1))))))

Crossrefs

Cf. A001813, A007623, A099563, A265894.

Cf. A265898 (a subsequence), A266119 (first differences), A266120 (terms immediately before descents).

Cf. also A031435.

Sequence in context: A022851 A325946 A050503 * A362882 A265898 A133869

Adjacent sequences: A265896 A265897 A265898 * A265900 A265901 A265902

Keyword

nonn

Author

Antti Karttunen, Dec 24 2015

Status

approved