A352375 Sum of digits of A007618.

5, 1, 2, 4, 8, 7, 5, 10, 11, 13, 8, 16, 14, 10, 11, 4, 8, 7, 14, 10, 11, 13, 17, 7, 5, 10, 11, 13, 8, 16, 14, 19, 11, 13, 8, 16, 14, 19, 20, 13, 8, 16, 14, 19, 20, 13, 8, 16, 14, 19, 20, 22, 8, 16, 14, 19, 20, 22, 17, 16, 14, 19, 20, 13, 17, 16, 14, 19, 20, 13

Offset

1,1

References

D. R. Kaprekar, Puzzles of the Self-Numbers. 311 Devlali Camp, Devlali, India, 1959.

Links

Table of n, a(n) for n=1..70.

D. R. Kaprekar, The Mathematics of the New Self Numbers, 1963. [annotated and scanned]

Formula

a(n) = A007953(A007618(n)).

a(n) = A007618(n+1)-A007618(n). - Chai Wah Wu, Mar 29 2022

Prog

(PARI) lista(nn) = my(s, x=5); for(n=1, nn, print1(s=sumdigits(x), ", "); x+=s); \\ Jinyuan Wang, Mar 22 2022
(Python)
from itertools import islice
def A352375_gen(): # generator of terms
    a = 5
    while True:
        yield (s := sum(int(d) for d in str(a)))
        a += s
A352375_list = list(islice(A352375_gen(), 20)) # Chai Wah Wu, Mar 29 2022

Crossrefs

Cf. A007618, A007953.

Sequence in context: A093316 A085758 A154529 * A157823 A159703 A059521

Adjacent sequences: A352372 A352373 A352374 * A352376 A352377 A352378

Keyword

nonn,base

Author

Mateusz Pasternak, Mar 14 2022

Extensions

More terms from Jinyuan Wang, Mar 22 2022

Status

approved