A285526 Terms of A285524 that mark the beginning of four consecutive equal values.

4, 12, 20, 27, 35, 43, 51, 59, 67, 74, 82, 90, 98, 106, 113, 121, 129, 137, 145, 153, 160, 168, 176, 184, 192, 200, 207, 215, 223, 231, 239, 246, 254, 262, 270, 278, 286, 293, 301, 309, 317

Offset

1,1

Links

Table of n, a(n) for n=1..41.

Prog

(PARI) half(n) = if (n % 2, n\2, n/2 - 1);
a285524(n) = {v = vector(half(n), d, d!*(d + 1)!*(2^(n-2*d-1)*stirling(n-d, d+1, 2))); w = vecsort(v, , 1); w[#w]; }
lista(nn) = {v = vector(nn, n, a285524(n+3)); for (k=1, #v-4, if ((v[k] == v[k+1]) && (v[k] == v[k+2]) && (v[k] == v[k+3]), print1(v[k], ", ")); ); }

Crossrefs

Cf. A285524, A285525.

Sequence in context: A273277 A100717 A365883 * A321466 A227226 A242118

Adjacent sequences: A285523 A285524 A285525 * A285527 A285528 A285529

Keyword

nonn,more

Author

Michel Marcus, Apr 20 2017

Status

approved