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.
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
KEYWORD
easy,nonn,word
AUTHOR
Jonathan Vos Post, Apr 03 2010
STATUS
approved