106721

Properties

Appears in sequences

• Number of subsequences of {1..n} such that all differences of pairs of terms are distinct (i.e., number of Golomb rulers on {1..n}).at n=29A054578
• Primes equal to a product of twin primes minus 1 divided by 2.at n=8A086870
• Ascending descending base exponent transform of triangular numbers (A000217).at n=4A113231
• (Product of twin primes - 1)/2.at n=23A120876
• Primes in A128490.at n=33A128491
• a(n) = 128*n^2 - 32*n + 1.at n=28A157331
• a(n) = 128*n^2 + 2528*n + 12481.at n=18A157436
• Primes in A166448.at n=15A166449
• Emirps whose binary conversion remains emirp when read in decimal.at n=27A226972
• Numbers k such that A155085(k) is in A037074.at n=20A352616
• Prime numbersat n=10171