1234765

Appears in sequences

• Permutations of 1234567: Numbers having each of the decimal digits 1,...,7 exactly once, and no other digit.at n=5A178477
• 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=6A187871