48807

Appears in sequences

• a(n) = |{m : multiplicative order of 10 mod m is equal to n}|.at n=41A059892
• Split positive integers into extending even groups and sum: 1+2, 3+4+5+6, 7+8+9+10+11+12, 13+14+15+16+17+18+19+20, ...at n=29A061317
• a(n) = 169*n^2 - 2*n.at n=16A158218