A364704 Smallest initial number k of n consecutive numbers satisfying sigma(k) < sigma(k+1) < ... < sigma(k+n-1).

1, 1, 1, 1, 36721681, 36721681

Offset

1,5

Comments

a(7) > 5*10^10. (Calculated using the b-file in A028965.)

Links

Table of n, a(n) for n=1..6.

Prog

(PARI) b(n) = my(k=n); while(sigma(k)<sigma(k+1), k++); k-n+1;
a(n) = my(k=1); while(b(k)<n, k++); k;

Crossrefs

Cf. A000203, A075028, A285893, A364680.

Cf. A028965, A053224, A364659, A364662.

Sequence in context: A204852 A345630 A346285 * A028965 A273508 A340713

Adjacent sequences: A364701 A364702 A364703 * A364705 A364706 A364707

Keyword

nonn,more,hard

Author

Seiichi Manyama, Aug 03 2023

Status

approved