123567

Appears in sequences

• Triangle read by rows in which the n-th row contains the n numbers in increasing order formed by the concatenation of first n-1 numbers. (The digits of the numbers with 2 or more digits are taken as one entity.) First row is taken to be 0.at n=24A081539
• Concatenation of the first n squarefree numbers A005117.at n=5A159901
• Integers of the form 8k+7 that can be written as a sum of four distinct squares of the form m, m+2, m+4, m+5, where m == 1 (mod 4).at n=43A243579
• Concatenation of the numbers from 1 to n but omitting 4.at n=5A262574
• Magic sums of 3 X 3 magic squares composed of primes in an arithmetic progression.at n=26A269324