A255307 Concatenation of the first n entries of the difference sequence of prime numbers (see A001223).

1, 12, 122, 1224, 12242, 122424, 1224242, 12242424, 122424246, 1224242462, 12242424626, 122424246264, 1224242462642, 12242424626424, 122424246264246, 1224242462642466, 12242424626424662, 122424246264246626, 1224242462642466264, 12242424626424662642, 122424246264246626426

Offset

1,2

Comments

The digits in A001223, the sequence of differences between consecutive primes, are concatenated to form this sequence.

Links

Table of n, a(n) for n=1..21.

Example

a(3) = 122, because the first three entries of A001223 are 1, 2, 2.

Mathematica

f[n_] := FromDigits@ Differences@ Prime@ Range[n + 1]; Array[f, 21] (* Robert G. Wilson v, Mar 31 2015 *)

Prog

(PARI) lista(nn) = {pp = 2; s = ""; forprime(p=3, nn, s = concat(s, p-pp); print1(eval(s), ", "); pp = p; ); } \\ Michel Marcus, Mar 31 2015

Crossrefs

Cf. A001223.

Sequence in context: A090843 A132927 A113574 * A199592 A285807 A078189

Adjacent sequences: A255304 A255305 A255306 * A255308 A255309 A255310

Keyword

nonn,base

Author

Waldemar Puszkarz, Feb 20 2015

Extensions

Edited by Wolfdieter Lang, Mar 26 2015

Status

approved