A156294 Sum of products of the digits of prime numbers and the position of the digits in the prime numbers.

2, 3, 5, 7, 3, 7, 15, 19, 8, 20, 5, 17, 6, 10, 18, 11, 23, 8, 20, 9, 13, 25, 14, 26, 23, 4, 10, 22, 28, 12, 26, 10, 28, 34, 36, 14, 32, 22, 34, 24, 42, 20, 22, 28, 40, 46, 7, 15, 27, 33, 17, 35, 13, 15, 33, 23, 41, 19, 37, 21, 27, 29, 24, 8, 14, 26, 12, 30, 32, 38, 22, 40, 36, 26, 44

Offset

1,1

Links

Indranil Ghosh, Table of n, a(n) for n = 1..50000

Formula

a(n) = A156207(prime(n)). - R. J. Mathar, Sep 10 2016

Example

For n = 5, prime(5) = 11 and A156207(11) = 1*1 + 1*2 = 3. So, a(5) = 3. - Indranil Ghosh, Feb 11 2017

Mathematica

Table[Total[IntegerDigits[#] Range@ IntegerLength@ #] &@ Prime@ n, {n, 75}] (* Michael De Vlieger, Feb 11 2017 *)

Prog

(PARI) g(x) = local(v, j); v=Vec((Str(x))); sum(j=1, length(v), j*eval(v[j]))
g1(n) = local(j); forprime(j=1, n, print1(g(j)", "))

Crossrefs

Sequence in context: A239037 A126050 A163821 * A126607 A124322 A209037

Adjacent sequences: A156291 A156292 A156293 * A156295 A156296 A156297

Keyword

base,nonn

Author

Cino Hilliard, Feb 07 2009

Status

approved