21131

Appears in sequences

• Decimal encoding of the prime factorization of n: concatenation of prime factors and exponents.at n=24A067599
• a(1) = 11 by convention; for n > 1, if n = p^a*q^b... then a(n) = concatenate(p,a,q,b,...).at n=25A068633
• Molien series for complete weight enumerators of trace-additive Hermitian self-dual codes over the Galois ring GR(4,2) that contain the all-ones vector.at n=9A100025
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=20A131523
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w<x+y.at n=34A182260
• Composite numbers whose product of digits is 6.at n=31A201055
• Numbers that eventually reach 1 under "x -> sum of 4th power of digits of x".at n=18A219111
• Numbers n such that n^10+10 is prime.at n=33A239347
• Number of nX3 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=7A279129
• T(n,k)=Number of nXk 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=47A279134
• T(n,k)=Number of nXk 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=52A279134
• Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences.at n=38A316713
• Numbers k such that 381*2^k+1 is prime.at n=34A323033
• a(n) is the sum, over all overpartitions of n, of the non-overlined parts.at n=15A335651