5882353

Properties

Appears in sequences

• Irregular table read by rows: row n lists prime factors of 10^n + 1, with multiplicity.at n=15A001271
• Largest prime factor of the "repunit" number 11...1 (cf. A002275).at n=14A003020
• Largest prime factor of 10^n + 1.at n=8A003021
• Largest prime factor of 10^n - 1.at n=15A005422
• Triangle of prime numbers in which n-th row lists all primes p such that 1/p has decimal period n, n >= 1.at n=24A046107
• Greatest prime number p(n) with decimal fraction period of length n.at n=15A061075
• Decimal numbers n such that after possibly prefixing leading 0's to n, the resulting number n' can be broken into 2 numbers of equal length, n' = xy, such that x^2+y^2 = n (y may also have leading zeros).at n=5A064942
• Primes p for which the period of 1/p is a power of 2.at n=20A072982
• a(n) = A077194(n)/n.at n=16A077195
• Greatest prime factor of n-th cyclic number.at n=1A087020
• a(n)=A069521(n)/n.at n=16A088391
• Decimal numbers n such that after possibly prefixing a leading 0 to n, the resulting number n' can be broken into 2 strings of the same length, n' = xy, such that x^2+y^2 = n.at n=5A101311
• Numbers m which when sandwiched between two 1's give a multiple of m.at n=8A116436
• Numbers k which when sandwiched between two 2's give a multiple of k.at n=15A116437
• Numbers k which when sandwiched between two 3's give a multiple of k.at n=15A116438
• Numbers k which when sandwiched between two 4's give a multiple of k.at n=22A116439
• Numbers k which when sandwiched between two 5's give a multiple of k.at n=15A116440
• Numbers k which when sandwiched between two 6's give a multiple of k.at n=29A116441
• Numbers k which when sandwiched between two 7's give a multiple of k.at n=13A116442
• Numbers k which when sandwiched between two 8's give a multiple of k.at n=27A116443