57970

Appears in sequences

• Triangular numbers with sum of digits = 28.at n=15A068132
• Triangular numbers whose sum of prime factors (with repetition) is also triangular.at n=30A076169
• a(n) = floor(C(n+8,8)/C(n+2,2)).at n=27A084631
• Triangular numbers which are the sum of distinct double factorials (A006882).at n=28A115650
• Triangle of the elementwise product of binomial coefficients with q-binomial coefficients [n,k] for q = 4.at n=17A157641
• Triangle of the elementwise product of binomial coefficients with q-binomial coefficients [n,k] for q = 4.at n=18A157641
• Triangular numbers T from A000217 such that (4*T+1)/13 is prime.at n=20A208294
• a(1) = 1; for n > 1, a(n) = prime(A101296(n)-1) * a(floor(n/2)).at n=47A292258
• Number of regions in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and three equally spaced points along the diameter (a total of n+3 points). See Comments for precise definition.at n=32A333642
• Numbers formed as the product of two numbers without consecutive equal binary digits and sharing no common bits between them.at n=8A337348
• a(n) is the number in the first column of the Trithoff (tribonacci) array that starts off the row containing the tail of n times the tribonacci sequence.at n=33A351689
• Triangular numbers which are products of five distinct primes.at n=17A357590
• Number of unordered pairs of strict integer partitions of n.at n=31A366317