A163119 Absolute values of the first differences in the digit chain of the concatenated primes.

1, 2, 2, 6, 0, 0, 2, 2, 6, 6, 8, 7, 1, 1, 7, 6, 2, 2, 4, 3, 3, 3, 1, 1, 3, 2, 2, 2, 4, 3, 5, 5, 1, 0, 6, 6, 4, 4, 2, 1, 5, 5, 1, 0, 2, 6, 1, 1, 0, 1, 3, 2, 1, 7, 6, 1, 9, 8, 0, 2, 2, 1, 5, 6, 2, 2, 0, 2, 4, 6, 2, 6, 8, 3, 5, 8, 4, 4, 0, 4, 2, 6, 5, 3, 2, 5, 1, 6, 6, 4, 2, 6, 2, 8, 7, 7, 0, 8, 8, 0, 8, 6, 2, 8, 2

Offset

1,2

Links

Table of n, a(n) for n=1..105.

Formula

a(n) = |A033308(n) - A033308(n-1)|.

Maple

read("transforms3") ; L := BFILETOLIST("b033308.txt") ; for i from 2 to 120 do printf("%d, ", abs(op(i, L)-op(i-1, L))) ; od: # R. J. Mathar, Jul 27 2009

Crossrefs

Cf. A000040, A033308.

Sequence in context: A158311 A158061 A270546 * A091085 A011144 A127649

Adjacent sequences: A163116 A163117 A163118 * A163120 A163121 A163122

Keyword

nonn,base

Author

Juri-Stepan Gerasimov, Jul 21 2009

Extensions

a(21) corrected by R. J. Mathar, Jul 27 2009

Status

approved