A067113 -id:A067113 - cp's OEIS frontend

A067114 Let N = 24681012141618202224262830..., the concatenation of the even numbers. Then a(n) = sum of first n digits of N.

2, 6, 12, 20, 21, 21, 22, 24, 25, 29, 30, 36, 37, 45, 47, 47, 49, 51, 53, 57, 59, 65, 67, 75, 78, 78, 81, 83, 86, 90, 93, 99, 102, 110, 114, 114, 118, 120, 124, 128, 132, 138, 142, 150, 155, 155, 160, 162, 167, 171, 176, 182, 187, 195, 201, 201, 207, 209, 215, 219

Offset: 1

Amarnath Murthy, Jan 08 2002

			a(5) = 2+4+6+8+1 = 21.

Cf. A067112, A067113.

Accumulate[Flatten[IntegerDigits/@Range[2,66,2]]] (* Harvey P. Dale, Nov 09 2011 *)

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003

A067115 Let N = 1357911131517192123252729... = concatenation of odd numbers. Then a(n) = sum of first n digits of N.

Original entry on oeis.org

1, 4, 9, 16, 25, 26, 27, 28, 31, 32, 37, 38, 45, 46, 55, 57, 58, 60, 63, 65, 70, 72, 79, 81, 90, 93, 94, 97, 100, 103, 108

Offset: 1

Amarnath Murthy, Jan 08 2002

			a(6)= 1+3+5+7+9+1 = 26.

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Cf. A067112, A067113, A067114.

Module[{nn=20,codd},codd=Flatten[IntegerDigits/@(2Range[0,nn]+1)];Accumulate[ codd]] (* Harvey P. Dale, Jul 09 2021 *)

cp's OEIS Frontend

A067114 Let N = 24681012141618202224262830..., the concatenation of the even numbers. Then a(n) = sum of first n digits of N.

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