121020

Appears in sequences

• Averages of twin primes such that the sum of the lower, average and upper parts of the twin primes are averages of other twin primes.at n=34A132929
• Digitally balanced numbers: ternary numbers which have the same number of 0's as 1's as 2's.at n=29A181986
• Position of 7^n among 7-smooth numbers (A002473).at n=25A232093