22903

Appears in sequences

• Initial terms associated with the arithmetic progressions in A086786.at n=15A087308
• Leading entries in triangle in A090548 and A113470.at n=15A090547
• Smallest semiprime (A001358) which is at the beginning of an arithmetic progression of n semiprimes whose largest term is as small as possible.at n=15A226834
• a(n) = PrimePi(4^n) - PrimePi(2^n).at n=9A248957
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n-2), where a(0) = 1, a(1) = 2, b(0) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=15A296285
• Number of compositions (ordered partitions) of the n-th triangular number into distinct triangular numbers.at n=17A331900