108345

Appears in sequences

• Doubly triangular numbers: a(n) = n*(n+1)*(n^2+n+2)/8.at n=30A002817
• a(n) = Fibonacci(n)*(2*Fibonacci(n)-1).at n=13A095122
• Triangular numbers t which are average of two consecutive primes p and p+4.at n=37A129752
• Triangular numbers t such that all the digits needed to write the consecutive triangular numbers from 0 to t fill exactly an equilateral triangle (no holes, no overlaps).at n=26A158030
• Triangular numbers which have one or more occurrences of exactly six different digits.at n=4A241789
• 26-gonal pyramidal numbers: a(n) = n*(n+1)*(8*n-7)/2.at n=30A256646
• Terms of A324315 (squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p) that are also hexagonal numbers (A000384) with index equal to their largest prime factor.at n=12A324319
• Composite numbers k such that P(k, 7) == 7 (mod k), where P(k, 7) = A084768(k) is the k-th Legendre polynomial evaluated at 7.at n=23A330205