A174990 Partial sums of A005606.

26, 41, 61, 81, 87, 93, 112, 131, 136, 150, 170, 175, 195, 215, 221, 227, 246, 265, 270, 284, 304, 324, 344, 364, 384, 404, 424, 444, 464, 484, 504, 524, 544, 564, 584, 604, 624, 644, 664, 684, 690, 696, 702, 708, 714, 720, 726, 732, 738, 744, 750, 756, 762

Offset

0,1

Comments

Partial sums of position of first letter of n (in English) in alphabet. The subsequence of primes in this partial sum begins: 41, 61, 131, 227, 823, 937, 1013, 1051. The subsequence of squares in this partial sum begins: 81, 324, 484, 1089.

Links

Table of n, a(n) for n=0..52.

Formula

a(n) = SUM[i=0..n] A005606(i).

Example

a(10) = 26 + 15 + 20 + 20 + 6 + 6 + 19 + 19 + 5 + 14 = 150 because "zero" starts with the 26th letter, "one" starts with the 15th letter, "two" starts with the 20th letter and so forth.

Crossrefs

Cf. A005606.

Sequence in context: A320255 A348286 A125218 * A285513 A138727 A248404

Adjacent sequences: A174987 A174988 A174989 * A174991 A174992 A174993

Keyword

easy,nonn,word

Author

Jonathan Vos Post, Apr 03 2010

Status

approved