Question

The pattern of $n$-th prime minus its reversal in even and odd bases

score 199 · Answer 1 · 2026-04-15 02:45:13

199

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The pattern of $n$-th prime minus its reversal in even and odd bases

Published on 15 Apr 2026 - 2:45

score 159 · Answer 2 · 2026-04-11 18:05:37

159

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Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null?

Published on 11 Apr 2026 - 18:05

score 317 · Answer 3 · 2026-04-14 08:59:58

317

Views

Under assumption that $\frac{M_{n+1}}{M_n} \le 2$, what is true?

Published on 14 Apr 2026 - 8:59

score 290 · Answer 4 · 2026-04-11 14:09:38

290

Views

How do I determine if I should submit a sequence of numbers to the OEIS?

Published on 11 Apr 2026 - 14:09

score 189 · Answer 5 · 2026-04-13 19:32:14

Where can I find the number of occurrences of every integer $n$ in the Sloane encyclopedia of integer sequence (OEIS)?

score 95 · Answer 6 · 2026-04-30 06:46:51

95

Views

Closed Form for a Sequence

Published on 30 Apr 2026 - 6:46

score 95 · Answer 7 · 2026-03-26 07:58:28

95

Views

Are all positive odd integer matchs this three conditions will be a prime number?

Published on 26 Mar 2026 - 7:58

score 116 · Answer 8 · 2026-04-12 02:07:25

116

Views

(Why) are $0, 1, 10, 120, 1540, 7140$ the only triangular tetrahedral numbers?

Published on 12 Apr 2026 - 2:07

score 95 · Answer 9 · 2026-03-26 07:57:14

95

Views

Finding the next term in a sequence: $1,4,17,19,148,.?.$

Published on 26 Mar 2026 - 7:57

score 307 · Answer 10 · 2026-03-26 08:00:37

307

Views

Number of strings of $\{0,1,2\}$ : the longest substrings of $1$ is odd-length.

Published on 26 Mar 2026 - 8:00

score 62 · Answer 11 · 2026-03-26 08:03:20

62

Views

How many of different connected graphs with n vertices? Excluding of isomorphic graphs.

Published on 26 Mar 2026 - 8:03

score 83 · Answer 12 · 2026-03-26 08:00:39

83

Views

Are the "distended" numbers precisely the numbers for which no two subsets of their divisors have the same sum?

Published on 26 Mar 2026 - 8:00

score 156 · Answer 13 · 2026-03-27 13:39:02

156

Views

Counting deltahedra with $2n$ faces

Published on 27 Mar 2026 - 13:39

score 103 · Answer 14 · 2026-03-26 01:11:00

103

Views

About $A_{n+1}=A_{n}+A_{n}^{2}$ and OEIS $A122888$

Published on 26 Mar 2026 - 1:11

score 44 · Answer 15 · 2026-03-26 12:34:51

44

Views

What is meant with "whose xor-sum is n"?

Published on 26 Mar 2026 - 12:34

List Question

The pattern of $n$-th prime minus its reversal in even and odd bases

Is the size of the Online Encyclopedia of Integer Sequences bounded by aleph-null?

Under assumption that $\frac{M_{n+1}}{M_n} \le 2$, what is true?

How do I determine if I should submit a sequence of numbers to the OEIS?

Where can I find the number of occurrences of every integer $n$ in the Sloane encyclopedia of integer sequence (OEIS)?

Closed Form for a Sequence

Are all positive odd integer matchs this three conditions will be a prime number?

(Why) are $0, 1, 10, 120, 1540, 7140$ the only triangular tetrahedral numbers?

Finding the next term in a sequence: $1,4,17,19,148,.?.$

Number of strings of $\{0,1,2\}$ : the longest substrings of $1$ is odd-length.

How many of different connected graphs with n vertices? Excluding of isomorphic graphs.

Are the "distended" numbers precisely the numbers for which no two subsets of their divisors have the same sum?

Counting deltahedra with $2n$ faces

About $A_{n+1}=A_{n}+A_{n}^{2}$ and OEIS $A122888$

What is meant with "whose xor-sum is n"?

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