A265395 Record values in A265388.

0, 6, 15, 33, 91, 435, 703, 1891, 2701, 12403, 18721, 38503, 49141, 79003, 88831, 104653, 146611, 188191, 218791, 226801, 269011, 286903, 385003, 497503, 597871, 665281, 721801, 736291, 765703, 873181, 954271, 1056331, 1314631, 1373653, 1537381, 1755001, 1869211, 1987021, 2035153, 2284453, 2741311, 3059101, 3270403, 3363121, 3913003

Offset

1,2

Comments

Question: Are all terms apart from 0 and 435 (= 3*5*29) semiprimes? See also comments in A265394 & A265396.

Links

Antti Karttunen, Table of n, a(n) for n = 1..192

Formula

a(n) = A265388(A265394(n)).

Prog

(PARI) lista(nn) = {r = 0; for (n=1, nn, nr = gcd(vector(n-1, k, binomial(2*n, 2*k))); if (nr > r, print1(nr, ", "); r = nr); ); } \\ Michel Marcus, Dec 08 2015. Note: this gives correct value for a(1) only from PARI version 2.8 onward, see A265388 for why. - Antti Karttunen, Dec 11 2015

Crossrefs

Cf. A265388, A265394, A265396.

Sequence in context: A051410 A083052 A333959 * A350596 A232604 A332735

Adjacent sequences: A265392 A265393 A265394 * A265396 A265397 A265398

Keyword

nonn

Author

Antti Karttunen, Dec 08 2015

Status

approved