32131

Appears in sequences

• Doubly triangular numbers: a(n) = n*(n+1)*(n^2+n+2)/8.at n=22A002817
• Strong pseudoprimes to base 47.at n=17A020273
• Strong pseudoprimes to base 70.at n=22A020296
• n written in fractional base 4/3.at n=21A024631
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 39 ones.at n=6A031807
• Concatenate n with n-th prime.at n=31A045532
• Triangular numbers with sum of digits = 10.at n=29A068129
• Triangular numbers which are a concatenation of two or more positive triangular numbers.at n=32A068144
• Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.at n=18A073873
• Sort the digits of these triangular numbers into descending order and drop zeros to get primes.at n=33A082923
• Triangular numbers which are one more than a product of distinct triangular numbers.at n=20A083517
• Triangular numbers whose sum of aliquot divisors is a prime number.at n=21A083676
• Row sums of triangle A097186, in which the n-th row polynomial R_n(y) is formed from the initial (n+1) terms of g.f. A057083(y)^(n+1), where R_n(1/3) = 3^n for all n >= 0.at n=5A097189
• Triangular numbers k such that 2*k-1 is also a triangular number.at n=3A097579
• Triangular numbers n divisible by the number of triangular numbers smaller than n.at n=41A117519
• Hexagonal numbers with prime indices.at n=30A117961
• Triangular numbers composed of digits {1,2,3}.at n=7A119097
• Triangular numbers T such that T+10 is the next prime after T.at n=8A129540
• Triangular numbers t such that t+10 is a prime.at n=33A129755
• Hexagonal numbers (A000384) which are sum of 2 other hexagonal numbers > 0.at n=26A133215