131110

Appears in sequences

• Arrays of dumbbells.at n=17A002940
• a(n) = 3*n^3 + 2*n^2 + n.at n=35A067389
• Numbers k such that 1*k + 1, 3*k + 1, 9*k + 1, 27*k + 1, 81*k + 1 are all primes.at n=12A112042
• Positive integers with the same number of 1s in base 10 and base 2.at n=21A153115
• Smallest number with exactly n 1's in its digits both in decimal and binary representation.at n=3A350691