70807

Appears in sequences

• Base-10 palindromes that start with 7.at n=30A043042
• A symmetric triangle, with sum the large Schröder numbers.at n=49A175124
• A symmetric triangle, with sum the large Schröder numbers.at n=50A175124
• Palindromic composite numbers starting with a digit 7.at n=22A222728
• Palindromes that are multiples of 11 and whose digit sum is also a multiple of 11.at n=13A346221
• Numbers k for which phi(A267099(k)) is equal to phi(k), but the number of 4m+1 and 4m+3 primes in the prime factorization of k (when counted with multiplicity) is not equal. Here A267099 is fully multiplicative involution swapping the positions of 4m+1 and 4m+3 primes, and phi is Euler totient function.at n=1A354194