27041

Appears in sequences

• Numbers k such that 3*10^k + 1*R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A056704
• Numbers k such that 6*k+5, 6*k+11, 6*k+17, 6*k+23 are consecutive primes.at n=24A090836
• a(n) = 40*n^2 + 1.at n=26A158602
• Triangle T(n, k) = Number of non-equivalent (mod D_4) ways to arrange k indistinguishable points on an n X n square grid so that no three of them are collinear. Triangle read by rows.at n=34A235453
• Number of non-equivalent (mod D_4) ways to arrange 5 points on an n X n square grid so that no three points are collinear.at n=3A235456
• Number of partitions of n such that m(1) > m(2), where m = multiplicity.at n=41A240056
• Triangle read by rows, the coefficients of the polynomials generating the columns of A287316.at n=23A287314
• Numbers k such that 309*2^k+1 is prime.at n=32A323144
• Number of integer partitions of n such that either the run-lengths or the negated run-lengths are unimodal.at n=40A332746