31746

Appears in sequences

• Hexagonal pyramidal numbers, or greengrocer's numbers.at n=36A002412
• a(0) = 1, a(n) = 31*n^2 + 2 for n>0.at n=32A010020
• Even hexagonal pyramidal numbers.at n=17A015226
• Eighth column (r=7) of FS(5) staircase array A062985.at n=10A062990
• Multiples of 5291.at n=6A178027
• a(n) is the least value of k such that k*n uses only the digit 2, or a(n) = -1 if no such multiple exists.at n=6A216485
• Records in A224796.at n=45A224719
• Number of permutations of [n] in which the length of every increasing run is 0 or 1 (mod 8).at n=13A322282
• Number of maximal antichains of subsets of {1..n}.at n=6A326358
• Minimal denominator among the fractions with n-digit numerator and n-digit denominator that best approximate Pi.at n=4A327361
• Numbers such that the sum of prime factors without repetition divides the product of prime factors without repetition and each division yields a greater quotient.at n=16A380487
• a(n) = Sum_{k=0..floor(2*n/5)} binomial(k+2,2) * binomial(k,2*n-5*k).at n=31A392270