A377051 Array read by antidiagonals downward where A(n,k) is the n-th term of the k-th differences of the powers of primes.

1, 2, 1, 3, 1, 0, 4, 1, 0, 0, 5, 1, 0, 0, 0, 7, 2, 1, 1, 1, 1, 8, 1, -1, -2, -3, -4, -5, 9, 1, 0, 1, 3, 6, 10, 15, 11, 2, 1, 1, 0, -3, -9, -19, -34, 13, 2, 0, -1, -2, -2, 1, 10, 29, 63, 16, 3, 1, 1, 2, 4, 6, 5, -5, -34, -97, 17, 1, -2, -3, -4, -6, -10, -16, -21, -16, 18, 115

Offset

0,2

Comments

Row k of the array is the k-th differences of A000961.

Links

Table of n, a(n) for n=0..77.

Formula

A(i,j) = Sum_{k=0..j} (-1)^(j-k)*binomial(j,k)*A000961(i+k).

Example

Array form:
        n=1:  n=2:  n=3:  n=4:  n=5:  n=6:  n=7:  n=8:  n=9:
  ----------------------------------------------------------
  k=0:   1     2     3     4     5     7     8     9    11
  k=1:   1     1     1     1     2     1     1     2     2
  k=2:   0     0     0     1    -1     0     1     0     1
  k=3:   0     0     1    -2     1     1    -1     1    -3
  k=4:   0     1    -3     3     0    -2     2    -4     6
  k=5:   1    -4     6    -3    -2     4    -6    10    -8
  k=6:  -5    10    -9     1     6   -10    16   -18     5
  k=7:  15   -19    10     5   -16    26   -34    23     9
  k=8: -34    29    -5   -21    42   -60    57   -14   -42
  k=9:  63   -34   -16    63  -102   117   -71   -28   104
Triangle form:
    1
    2    1
    3    1    0
    4    1    0    0
    5    1    0    0    0
    7    2    1    1    1    1
    8    1   -1   -2   -3   -4   -5
    9    1    0    1    3    6   10   15
   11    2    1    1    0   -3   -9  -19  -34
   13    2    0   -1   -2   -2    1   10   29   63
   16    3    1    1    2    4    6    5   -5  -34  -97

Mathematica

nn=12;
t=Table[Take[Differences[NestList[NestWhile[#+1&, #+1, !PrimePowerQ[#]&]&, 1, 2*nn], k], nn], {k, 0, nn}]
Table[t[[j, i-j+1]], {i, nn}, {j, i}]

Crossrefs

Row k=0 is A000961, exclusive A246655.

Row k=1 is A057820.

Row k=2 is A376596.

The version for primes is A095195, noncomposites A376682, composites A377033.

A version for partitions is A175804, cf. A053445, A281425, A320590.

For squarefree numbers we have A377038, nonsquarefree A377046.

Triangle row-sums are A377052, absolute version A377053.

Column n = 1 is A377054, for primes A007442 or A030016.

First position of 0 in each row is A377055.

A000040 lists the primes, differences A001223, seconds A036263.

A023893 and A023894 count integer partitions into prime-powers, factorizations A000688.

Cf. A025475, A053707, A093555, A174965, A361102, A376340, A376598, A376653.

Sequence in context: A331363 A359368 A353490 * A226131 A375037 A334318

Adjacent sequences: A377048 A377049 A377050 * A377052 A377053 A377054

Keyword

sign,tabl

Author

Gus Wiseman, Oct 20 2024

Status

approved