22953

Appears in sequences

• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=8A045109
• a(n) = p^2 + p + 1 where p runs through the primes.at n=35A060800
• Wieferich numbers (1): n > 1 such that 2^A000010(n) == 1 (mod n^2).at n=7A077816
• Numbers arising in computing the Turan function of cycles of length 4.at n=39A217004
• Number of distinct values of the sum of 3 products of three 0..n integers.at n=20A225260
• Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.at n=12A246503
• Numbers n > 1 such that 2^m == 1 (mod n^2), where m = A002326((n-1)/2).at n=6A265630
• Numbers n > 1 such that 2^lambda(n) == 1 (mod n^2), where lambda(n) is the Carmichael lambda function (A002322).at n=7A291961
• Numbers k such that k^2 | A038199(k).at n=35A317475
• Numbers k such that the ring of integers of Q(2^(1/k)) is not Z[2^(1/k)].at n=26A342390
• Expansion of e.g.f. cosh(sqrt(3) * (exp(x) - 1)).at n=8A357615
• Square array T(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. cosh( sqrt(k) * (exp(x) - 1) ).at n=74A357681
• Index where n first appears in A381658.at n=59A381659
• The smallest term in A061862 with exactly n distinct partitions into a sum of nonnegative powers of its digits.at n=6A388297