cp's OEIS Frontend

A139261 Triangle read by rows: row n lists the first n digits of the decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma.

%I A139261 #8 Jun 30 2025 10:49:13
%S A139261 5,5,7,5,7,7,5,7,7,2,5,7,7,2,1,5,7,7,2,1,5,5,7,7,2,1,5,6,5,7,7,2,1,5,
%T A139261 6,6,5,7,7,2,1,5,6,6,4,5,7,7,2,1,5,6,6,4,9,5,7,7,2,1,5,6,6,4,9,0,5,7,
%U A139261 7,2,1,5,6,6,4,9,0,1
%N A139261 Triangle read by rows: row n lists the first n digits of the decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma.
%C A139261 Also, successive digits of A139260.
%e A139261 Triangle begins:
%e A139261 ....... 5
%e A139261 ...... 5,7
%e A139261 ..... 5,7,7
%e A139261 .... 5,7,7,2
%e A139261 ... 5,7,7,2,1
%t A139261 a[n_]:=FromDigits[RealDigits[EulerGamma,10,n][[1]]];IntegerDigits/@Array[a,12]//Flatten (* _James C. McMahon_, Jun 29 2025 *)
%Y A139261 Decimal expansion of gamma: A001620.
%Y A139261 Cf. A138114, A138115, A138116, A139258, A139259, A139260.
%K A139261 easy,nonn,tabl,base
%O A139261 1,1
%A A139261 _Omar E. Pol_, May 01 2008