23454

Appears in sequences

• Denominators of continued fraction convergents to sqrt(907).at n=10A042753
• Triangle, read by rows, where the n-th row is the first n terms of the n-th self-convolution of the sequence formed by flattening this triangle.at n=43A086606
• Integers are written in the form abcd...n where "a" means "At position a in this integer there is a digit b"; "b" means: "at position b there is a digit c"; "c" means: "at position c there is a digit d"; ... and "n" means nothing. No repetitions are allowed (like in the integer 111).at n=41A105958
• Numbers n with property that n^2 is a sum of some 70 successive primes.at n=32A166256
• a(n) = name of smallest positive number in Spanish which has the letter E in the n-th position starting from the end, or -1 if no such number exists.at n=40A173182
• From the enumeration of involutions avoiding the pattern 4321.at n=17A217525
• a(n) = coefficient of x^n*y^n in Product_{n>=1} (1 - (x^n + y^n))^3.at n=25A322214
• a(n) is the number of words of length n over the alphabet {a,b,c} with an even number of appearances of the letter 'a' and the sum of appearances of the letters 'b' and 'c' add up to at most 3.at n=27A341896
• a(n) is the number of 4 element sets of distinct integer sided strict rectangles that fill an n X n square.at n=36A384724