42195

Appears in sequences

• [ exp(1/22)*n! ].at n=7A030839
• Running distances (in meters) in Olympic athletics.at n=7A053402
• a(n) = 49*(n*(n+1)/2) + 6.at n=41A061792
• Triangular numbers with sum of digits = 21.at n=27A068131
• Triangular numbers equal to the sum of a prime number with its index.at n=25A115886
• Triangular numbers for which the sum of the digits is an octagonal number.at n=30A117523
• Triangular numbers t which are average of two consecutive primes p and p+4.at n=30A129752
• Numbers n with following property: suppose n^6 = d1 d2 d3 ...dk in decimal; then d1! + d2! + ... + dk! is a square.at n=19A130688
• Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.at n=9A208103
• Triangular numbers that are hypotenuse and a leg of a Pythagorean triple.at n=38A213188
• Least triangular number t such that t = prime(n)*triangular(m) for some m>0, or 0 if no such t exists.at n=24A225503
• Least triangular number of the form p*triangular(n) where p is a prime number, or 0 if no such triangular number exists.at n=29A225789
• Triangular numbers which become primes when their rightmost digit is removed.at n=35A227936
• Triangular numbers which have one or more occurrences of exactly five different digits.at n=32A241788
• Triangular numbers that in base 2 have the same number of 0's and 1's.at n=26A345348