31004

Appears in sequences

• Numbers k such that 141*2^k+1 is prime.at n=44A032420
• Triangle read by rows: T(n, k) = number of hill-free Dyck paths (i.e., no peaks at height 1) of semilength n and having k peaks.at n=60A100754
• Number of permutations of length n which avoid the patterns 1234, 3142, 3421.at n=13A116767
• Number of (w,x,y,z) with all terms in {0,...,n} and w=max{w,x,y,z}-min{w,x,y,z}; i.e., the range of (w,x,y,z) is its first term.at n=25A212744
• Numbers n such that Bernoulli number B_{n} has denominator 1410.at n=36A272369
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UD, HH and DU.at n=21A329664