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A171444 Sum of three consecutive reversed primes. 1
10, 15, 23, 49, 113, 193, 194, 215, 137, 178, 100, 121, 122, 143, 204, 146, 187, 109, 130, 151, 172, 233, 215, 278, 481, 1103, 1903, 1913, 1933, 1163, 1583, 1793, 2603, 2023, 1843, 1263, 1873, 1493, 2103, 1523, 1343, 763, 1373, 2173, 1894, 1425 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

FORMULA

a(n)=r(p(n))+r(p(n+1))+r(p(n+2)) where p(n) is the n-th prime number, and r(n) is the number attained by the reversal of the digits of n (e.g., r(1230)=321)

EXAMPLE

(from primes 11, 13, and 17): 11+31+71=113;

(from primes 13, 17, and 19): 31+71+91=193;

(from primes 173, 179, and 181): 371+971+181=1523.

MATHEMATICA

r[n_] := FromDigits[Reverse[IntegerDigits[n]]]; Table[r[Prime[n]] + r[Prime[n+1]] + r[Prime[n+2]], {n, 50}]

CROSSREFS

Cf. A034961.

Sequence in context: A050200 A034961 A207637 * A227371 A117847 A057990

Adjacent sequences:  A171441 A171442 A171443 * A171445 A171446 A171447

KEYWORD

nonn,base

AUTHOR

Vincenzo Librandi, Dec 09 2009

EXTENSIONS

More terms from Matthew Conroy, Dec 28 2010

STATUS

approved

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Last modified October 20 12:47 EDT 2019. Contains 328257 sequences. (Running on oeis4.)