12347658

Appears in sequences

• Permutations of 12345678: Numbers having each of the decimal digits 1..8 exactly once, and no other digit.at n=14A178478
• a(n) is the concatenation of the numbers appearing in row n of the lexicographically earliest prime pyramid (A051237).at n=7A187869
• a(1)=1; for n > 1, a(n) is the smallest number that is formed by arranging the decimal numbers "1", "2", ..., "n" in some order so that the sum of every pair of adjacent numbers "i" "j" is prime.at n=7A187871